Pete/pete_games_plan.md

# Pete Games — games.parodia.dev

A web casino/arcade on Pete, authenticated by Authentik, playing for gogobee euros.
Blackjack, Texas Hold'em, UNO (normal + no-mercy), Hangman, Trivia.

Companion to `gogobee_mischief_plan.md`, which already established the web↔game seam.
This plan reuses that seam wholesale and does not invent a second one.

---

## 0. Progress — last updated 2026-07-14

A multi-session build. This section is the handover; read it before anything else.

### Decisions taken (these close §9's open questions)

- **Chips are 1:1 with euros.** No second denomination.
- **Session buy-in cap: €10,000**, enforced against chips held *plus* buy-ins still
  in flight, so it can't be cleared by firing several requests at once.
- **A house rake**, 5% in blackjack's `DefaultRules`, taken from *winnings only* —
  never the stake. A push returns the bet untouched; a loss is never charged a fee.
- **The site shares Pete's design, not Pete's shell.** *(Revised 2026-07-13 — this
  replaces the earlier "the site must look like Pete", which meant `layout.html`
  itself.)* The casino is its own place. It takes the design language — Fredoka/
  Nunito, the four palette vars, `rounded-3xl`, `shadow-pete`, the bubbly weight of
  everything — and takes none of the furniture: no Pete avatar, no channel nav, no
  search, no reader, no settings, no weather canvas, no PWA. It has its own layout
  (`games_layout.html`), its own header, its own footer, its own scripts. Still not
  an SPA; still server-rendered `html/template`.
- **It has two names, on a clock.** Casinopolis by day, Casino Night Zone from six
  in the evening — palette, felt and the sign over the door all change together.
  This is the news app's phase system pointed at a joke: one `data-room` attribute,
  two palette blocks, and a rule shared between `roomAt()` in Go (first paint) and
  the same rule in JS (the player's own clock, so a player abroad gets their own
  evening).
- **Dealing is animated.** Cards visibly dealt and flipped, chips that move. This is
  a requirement, not polish to drop when the clock runs out.

### Done

- **Phase 0 — euro idempotency (gogobee).** `euro_transactions.external_id` + a
  partial unique index, and `CreditIdem`/`DebitIdem` in `internal/plugin/euro.go`:
  balance mutation and transaction log in one tx, keyed by the escrow GUID. A replay
  reports success without moving money again; a rejection writes nothing, so the same
  GUID stays retryable once the player is good for it. Six tests, including eight
  goroutines racing one GUID. *(gogobee `ab2bcf0`)*
- **`pete/internal/games/cards`** — the shared deck gogobee never had. RNG is
  threaded, never the package global, so a hand is reproducible from its seed.
  *(pete `8310b30`)*
- **`pete/internal/games/blackjack`** — pure reducer,
  `ApplyMove(state, move) (state, []Event, error)`, where an error means the move was
  illegal and nothing else. State is a plain value: it serializes, so a hand survives
  a redeploy, and it replays. Six decks, 3:2, dealer hits soft 17, plus the rake.
  *(pete `8310b30`)*
- **`pete/internal/storage/games.go`** — the euro/chip border. `game_chips`,
  `game_escrow`, `game_hands`. Chips appear only once gogobee confirms it took the
  euros; chips are destroyed the moment a cash-out opens (so they can't be bet while
  their euros are in flight) and come back if the credit fails. Table cap, 30-minute
  reaper, per-hand audit log with seeds. 17 tests. *(pete `f9a98f7`)*

- **The wire protocol.** Pete serves `GET /api/games/escrow/pending`, `POST …/claim`,
  `POST …/settled` (`internal/web/games.go`), bearer-authed on the adventure ingest
  token. gogobee polls every 3s (`internal/plugin/pete_games.go`), claims a row,
  calls `DebitIdem`/`CreditIdem` against the escrow GUID, and pushes the verdict
  back through `pete_emit_queue` — which grew a `path` column so escrow verdicts
  ride the same durable queue as adventure facts rather than getting a second one.
  `peteclient.Flush` sends the verdict immediately instead of waiting out the 15s
  sender tick, because a player is watching a spinner. A row re-offered after a
  gogobee crash replays as a no-op: 13 tests across both repos, including a fake
  Pete that offers the same row three times and a player who is charged once.

- **Identity.** `preferred_username` now rides in the signed session, and
  `SessionUser.MatrixUser(server)` maps it to `@user:parodia.dev`. The session cookie
  takes an opt-in `web.auth.cookie_domain`, so a sign-in on news is a sign-in on games;
  the OAuth round-trip cookie deliberately stays host-only, and the redirect_uri is
  derived per-request so a login that starts on games comes back to games. A Host we
  don't own is never echoed into a redirect. *(pete `cb84e1d`)*
- **Blackjack, playable end to end.** `game_live_hands` (the hand in progress,
  engine state and all, so a redeploy mid-hand is survivable), the session-authed play
  surface (`internal/web/games_play.go`), the lobby and table pages, and the dealing
  animation. Driven in a real browser: chips staked before the deal, hole card withheld
  from the payload until the reveal, payout settled back into the stack.

- **The casino moved out.** Its own layout (`games_layout.html`), parsed as its own
  template set alongside the news one; `gamesPage` no longer embeds the news
  `pageData`, which is what stops the old furniture drifting back one convenient
  field at a time. Two rooms on a clock (above), the felt reupholstered from the
  room's vars, and a house mark that is a honeycomb chip rather than a face.
- **The cards are cards.** Corner indices in both corners (the bottom one upside
  down, as printed), pips laid out on the three-by-seven grid a real deck uses,
  bottom-half pips inverted, courts as a letter with the suit over each shoulder,
  and a screen-reader label that says "Queen of hearts" instead of "Q♥".

- **The money moves.** The felt grew the two things it was missing: a **bet spot**
  in front of you and the **house's rack** beside the shoe, so every chip on the
  table is always travelling between one of those and the other. A bet is *built*
  by throwing chips onto the spot (the chip you clicked is the chip that flies);
  the stake sits there through the hand; the house pays out of its rack into the
  spot; the whole pile is then swept back to your pile. A loss goes to the rack and
  doesn't come back. `casino-fx.js` is the shared engine — `fly`/`flyMany` (WAAPI,
  on an arc, out of a fixed overlay so nothing clips them), `chipsFor` (an amount
  broken into the fewest chips, capped at what's worth watching), `burst`, `count`.

  Two rules hold it together, and both are load-bearing:

  1. **The number under the pile is a readout of the pile**, never the other way
     round. So the bet starts at zero rather than at a default nobody put down, and
     a settled hand puts your stake *back on the spot* as a standing bet — otherwise
     the panel prints "your bet: 300" over an empty circle.
  2. **The chip bar does not move until the chips that justify it have landed.** On
     a live hand the money applies immediately (your stake left your pile and is
     visibly on the spot); on a settling hand `play()` holds the apply until the
     payout has swept home. A counter that pays you before the dealer turns over is
     a counter that has told you the ending.

  Also: cards land with weight (overshoot, a shadow that takes the hit, a degree or
  two of resting tilt each), the dealer takes a beat before drawing out, and a
  natural gets confetti — the only thing in the room that does.

- **A way to actually look at it.** `internal/web/devcasino_test.go` is the casino on
  a port with one signed-in, funded player: `PETE_DEV_CASINO=:7788 go test
  ./internal/web -run TestDevCasino -timeout 0`. Skipped without the env var. It
  wires its own routes because `New()` decides whether the casino exists at the
  moment it builds the mux, and the test rig signs the player in afterwards. **Drive
  the table in a real browser before believing anything about it** — this pass found
  a white-on-white verdict pill, a rack that collided with the dealer, and Hit still
  being offered over a table that was being paid out, none of which a Go test can see.

- **Deployed, 2026-07-14.** https://games.parodia.dev is live. What that took, since
  the shape of it was not quite what this plan guessed:
  - The edge is **Traefik**, not Caddy (`/mash/traefik/config/provider.yml`, root-owned,
    file provider so it hot-reloads). The casino needed no router of its own — the
    existing `pete` router's rule grew a second host:
    ``Host(`news.parodia.dev`) || Host(`games.parodia.dev`)``, and ACME issued the cert
    on its own. DNS for the games host already pointed at the box.
  - Authentik lives at **auth.parodia.dev**, and the app's OAuth2 provider is "Pete News"
    (pk 12). It now holds both callbacks, strict: news and games. The provider's
    `redirect_uris` is a list of objects, not strings.
  - Server config gained `[web.games]` (enabled, host, `matrix_server = "parodia.dev"`)
    and `web.auth.cookie_domain = ".parodia.dev"`, which is what makes a news sign-in a
    games sign-in. Old host-only session cookies don't carry over — a signed-in user
    signs in once more, and after that the session spans both.
  - **gogobee is not on that box.** It runs on the LAN at `reala@192.168.1.212`, in a
    screen session, out of `~/gogobee`, and it has no key for its own GitHub remote —
    deploy it with `ssh -A` so the pull rides your agent. Its escrow loop needs no new
    config: it is gated on the `FEATURE_PETE_NEWS` / `PETE_INGEST_*` env in `~/.env`
    that adventure news already set. Restarted, it logs
    `pete games: escrow loop started interval=3s`.

- **Hangman, and it plays for chips.** *(2026-07-14. This revises §7's "Phase 2 —
  no escrow": the decision was that a free game in a casino reads as a demo, so
  hangman stakes chips like everything else and reuses the money path whole.)*
  - **The gallows is the payout meter.** You pick a tier, stake, and get six
    lives. Every wrong guess draws a limb *and* takes a tenth off the base
    multiple — one event, shown as one event. Short phrases pay 2.6×, medium 2.0×,
    long 1.6× (short is hardest: fewer letters, less to go on). Floored at 1×, so
    a win never hands back less than the stake, and the rake still comes out of
    winnings only.
  - `internal/games/hangman` — the same pure reducer as blackjack, phrases
    embedded (`phrases.txt`, 205 of them, video-game flavoured, lifted from
    gogobee). `State.Pays()` is the number the felt quotes *and* the number
    settle() lands on: they were briefly two sums and the table advertised a
    pre-rake payout it didn't honour. One function now, and a test that walks a
    game asserting the quote equals the payout at every step.
  - **The browser never sees the phrase.** Cells carry the letter or an empty
    string — not the letter with a hidden flag — and the phrase itself is only
    added to the payload once the game is over and it decides nothing.
  - Two things the storage layer already gave us for free, and one it didn't:
    `game_live_hands` is keyed on the *player*, so "one game at a time" holds
    across games with no new code (a live hangman 409s a blackjack deal). But
    `table()` used to unmarshal any live row as a blackjack hand — which does not
    *fail* on a hangman row, it just silently yields an empty hand. It now
    dispatches on `live.Game`.
  - `commit()` in games_play.go is the shared settle path (seat → pay → audit →
    clear → touch). Both games go through it so neither re-derives an ordering
    that took a while to get right. `casinoRoutes()` is likewise the single route
    list, because devcasino_test.go has to wire its own mux and a second copy is
    a copy that stops including the newest game.
  - Driven in a real browser, win and loss: a 200 stake at 2.34× paid 455 and the
    bar landed on it; six wrong took the stake and nothing more; a reload
    mid-phrase brought back the board, the limbs, the multiple, the spent keys and
    the stake on the spot. Two layout bugs only the browser could show: the lives
    counter ran under the house rack, and the board wrapped a word early because
    the rack's clearance padding was on the whole column instead of the one row
    level with it.

- **Solitaire, and it plays for chips.** *(2026-07-14, jumping the queue ahead of
  trivia because the user asked for it.)*
  - **Vegas scoring**, which is the only way solitaire has ever actually been a
    gambling game. You do not win or lose the deal — you **buy the deck** for your
    stake, and every card you get home to a foundation pays a fifty-second of the
    tier's multiple back. Cash the board whenever you like and keep what you've
    banked; a board that has gone dead is therefore a decision, not a wall. There
    is no undo, because the stake is spent the moment the deck is bought and an
    undo would be a way to walk a losing board backwards until it wins.
  - Three deals, and the two dials are the whole difficulty of Klondike: **Patient**
    (draw 1, unlimited passes, 1.4×, square at 38 cards), **Vegas** (draw 3, three
    passes, 2.2×, square at 24), **Cutthroat** (draw 3, one pass, 3.4×, square at
    16). `Tier.BreakEven()` is what the felt quotes, because "2.2×" tells a player
    nothing about a game where the multiple is paid a card at a time.
  - `internal/games/klondike` — the same pure reducer. `Pays()` is one function for
    the same reason hangman's is. Two fuzzers hold the deck together: no card is
    ever lost or duplicated by any sequence of moves, and the board stays
    well-formed (every face-up run is a run, no column has cards face-down under
    nothing). The first thing a test caught was a **recycle that reversed the
    waste** — it flips as a block, so the card drawn first comes out first, and
    reversing would have dealt a different game on every pass and broken the seed.
  - **The browser never sees the stock or a face-down card.** Bigger than
    blackjack's hole card: that's most of the deck. Columns send a face-down
    *count*, never the cards. The events, unlike blackjack's, need no filtering —
    every card they carry is one the move just turned face up.
  - **The table re-renders and animates the difference (FLIP).** Blackjack plays
    back a script because a hand only grows at one end; solitaire moves runs from
    anywhere to anywhere and an auto-finish moves eleven cards at once. So
    `solitaire.js` measures where every card is, re-renders the board the server
    sent, and plays each card from its old place to its new one. The board on
    screen is therefore always exactly the board the server says exists. The events
    supply only what a diff can't: where a *newly revealed* card came from (the
    stock, or a flip in place) and what the board is now worth.
  - **The rules are mirrored in JS**, deliberately, and only to light up the columns
    a held card can go to. The server still decides every move; a disagreement
    snaps the board back to whatever it says. Being shown where a card goes is the
    game teaching you; being told no after you commit is the game scolding you.
  - Two things got extracted rather than copied, which is the rule this room runs
    on: **`casino-cards.js`** (the deck — faces, pips, the flip; was inside
    blackjack.js) and **`PeteFX.spot()`** (the pile of chips and the number under
    it, which owns the "the number is a readout of the pile" rule so no table can
    break it). Blackjack now uses both.
  - **Driven in a browser, 2026-07-14, and it holds up.** Every worry on the list
    came back clean. A Patient deck bought for 200 dealt a correct Klondike (28 cards
    across the seven columns, 24 left in the stock), quoted `+5.4 a card` and `38 more
    to break even` — which is the tier's arithmetic, not a guess — and the money
    conserved end to end: 5,000 → 4,800 to buy the deck → one card home banked 5 →
    4,805 cashed out. The FLIP does not jump on a re-render. The seven columns fit at
    390px with no horizontal overflow (`docScrollW == clientW`), the rail stacks under
    the board rather than colliding with it, and the console is silent.
  - **And blackjack survived the rewire**, which was the real thing to check. Five
    hands, and the felt agreed with `/api/games/table` on every one. The rake still
    comes out of winnings only: a 400 win paid back 780 (the stake, plus 400 less 5%),
    and a push returned all 600 with nothing taken.
  - One thing to know before you go looking for a bug that isn't there: the bare
    `<span data-chip>` elements are the *house rack's decoration*. Only
    `button[data-chip]` carries a listener. A driver script that clicks `[data-chip]`
    hits the rack, nothing happens, and it looks like the bet is broken. Blackjack's
    action buttons are also `[data-move="stand"]`, not `[data-stand]`.

- **Trivia, and it plays for chips.** *(2026-07-14. Built, and now **played** — see
  "Driven in a browser" at the bottom of this entry, which is where the two bugs
  were.)*
  - **A ladder.** Stake once, then answer a run of twelve. Every right answer
    multiplies what you're holding, a wrong one loses the lot, and you may walk
    with what you've built. Clearing all twelve ends the run and banks it — a
    ladder with no top is a slot machine you can't stop playing, and eventually
    every player loses everything to one bad question.
  - **The clock is the game, and it is the anti-google mechanism.** Trivia answers
    are lookupable, so a right answer is worth what it's worth *when you give it*:
    the multiple decays from Fast to Buzzer across the tier's limit (easy 1.30→1.10
    over 20s, medium 1.55→1.20 over 18s, hard 1.90→1.30 over 15s), and running out
    of time loses exactly as much as being wrong. A timeout that merely cost you the
    speed bonus would make "look it up in the other tab" the strongest way to play.
    The countdown in the browser is decoration; the clock that scores is
    `time.Now()` against the `AskedAt` the server stamped. A reload does not restart
    it.
  - **A pure reducer still, but the time is an argument** — `ApplyMove(state, move,
    now)`. A reducer cannot own a timer, so it doesn't: the only thing that knows
    what o'clock it is remains the caller, and the engine stays value-in, value-out.
  - **You cannot walk off the first rung** (`ErrNothingBanked`). If you could, seeing
    question one and walking would be a free look: stake, peek, walk, restake, and
    reshuffle until the question is one you happen to know. The first question is the
    price of sitting down.
  - **The browser never learns which answer is right.** The four answers cross the
    wire without the index; that index is in the engine state, on the server. It
    comes back only in the event that *decides* the question, by which point knowing
    it is worth nothing. The ladder's remaining questions are never sent at all.
  - `internal/games/trivia` — engine, 11 tests. The one that matters most is the
    same one hangman needed: the number the felt quotes (`Pays()`) is asserted equal
    to the number `settle()` lands on, at every rung.
  - **The bank is prefetched, not fetched per question** (`internal/opentdb`,
    `storage.DrawTrivia`, table `trivia_questions`). A ladder asks a question every
    fifteen seconds with money on a clock the player is scored against; a live fetch
    would put OpenTDB's latency and rate limit *inside* that clock. The refill is a
    slow background drip (`StartTriviaBank`, 400 per difficulty, one request per six
    seconds, stops early when a batch adds nothing new), and a round never waits on
    it. Answers are shuffled per-game against the game's own seed, so where the right
    answer sits in the table tells a player nothing.
  - **The dev rig seeds its own bank.** A fresh dev database has an empty bank and
    every start 503s, so `TestDevCasino` now takes one real batch per difficulty
    from OpenTDB (`seedTriviaBank`) — fifty questions each, four ladders' worth,
    through the same fetch-decode-store path production uses. It does *not* run
    `StartTriviaBank`: a rig that spends its first two minutes dripping four hundred
    questions per difficulty out of a free API is a rig you cannot use.
  - **Driven in a browser, 2026-07-14, and the clock and the money hold up.** The
    ladder plays: a 200 stake on Easy dealt a real OpenTDB question with its
    entities decoded, the clock bar drained honestly (847px → 711px over three
    seconds, countdown 18.7s → 15.7s), two right answers compounded 1.00× → 1.26×
    → 1.58×, and walking paid exactly the 311 the felt had been quoting. The
    reveal marks the wrong pick red and the right answer green. A reload mid-rung
    brought the board back and — the thing that matters — the server's clock kept
    running through it (17.5s left before, 16.2s after; it does not restart).
    **The timeout lands as a timeout**, which was the loudest worry: going quiet
    through a 20s question fired the auto-submit at zero, came back 200 with a
    `timeout` event and "Out of time.", not a "that move isn't legal". The next
    question's answer is never sent (`correct: -1` in the ask event); only the
    decided one reveals.
  - **Two bugs, and only a browser could have found either.**
    1. **The spot printed double the stake after every settled game.** `standing()`
       set `spot.amount` and *then* poured the chips on, and `pour` grows the pile
       from whatever it is told is already there — so a 200 stake settled to a spot
       reading 400, and a 400 one to 800. This is exactly the rule the felt is built
       on ("the number under the pile is a readout of the pile") failing quietly:
       the money was always right, the *number under the chips* was not. Blackjack
       and hangman pour without pre-setting; trivia now does too.
    2. **The house rack sat on top of the multiplier at 390px.** The rack is a 147px
       block inset 5.75rem from the edge, and that inset is not a margin — it is the
       width of *blackjack's shoe*, which the rack sits beside. On a phone that puts
       it in the middle of the felt, on top of trivia's "1.53×". On small screens the
       rack now shrinks and, where there is nothing in the corner, pulls into the
       corner. Which rack is which is what `data-at` says: unmarked is alone in the
       corner, `shoe` is blackjack (pull that one to the edge and it slides under the
       deck — this was caught after doing exactly that), `rail` is solitaire, whose
       rack isn't on the felt at all. All four tables re-checked at 390px and 1280px,
       live games on the felt: no overlap with text, no overlap with the shoe, no
       horizontal overflow, desktop geometry unchanged.

### Next, in order

1. Phase 3 (UNO), Phase 4 (hold'em) as below.
2. Trivia is played but not deployed. Hangman, solitaire and trivia are all still
   sitting on main un-deployed — the server runs `StartTriviaBank`, so its bank
   fills itself once the binary is out there, but the first player to try a ladder
   in the first minute after a deploy gets the 503.

Still open on the table itself, none of it blocking: **split** isn't implemented (the
engine has no move for it), the felt is roomy at desktop widths with only one seat on
it, and the chip animations are tuned for one player — a second seat would need the
spot to be per-seat rather than the singleton it is now.

### How the browser half fits together

- `GET /games` (lobby), `GET /games/blackjack` (table) — signed-in only. On the games
  host, the mux prefixes `/games` onto the path, so the lobby is that host's `/`. Shared
  paths (`/api/`, `/auth/`, `/static/`) mean the same thing on every host and are left
  alone.
- `GET /api/games/table`, `POST /api/games/{buyin,cashout}`,
  `POST /api/games/blackjack/{deal,move}` — session-authed, JSON, all returning the same
  `tableView` so the money and the felt can never disagree.
- **The browser never sees the shoe.** The dealer's hole card is *absent* from the
  payload — not flagged hidden — until the reveal, and the deck lives only in
  `game_live_hands`. The response carries the engine's events (one per card off the
  shoe), which is what the table plays back as an animation.
- Money order-of-operations: stake leaves the stack *before* the hand is dealt, in the
  same statement that checks it's there; the hand is *seated* (a plain INSERT on the
  primary key) before it can settle, which is what makes a double-clicked Deal a 409 with
  the stake refunded rather than a silently overwritten hand.

### Notes for whoever picks this up

- SQLite runs at `MaxOpenConns(1)` in *both* repos. Any `db.Get().Exec` inside an
  open transaction deadlocks against itself. Do the pre-work before `Begin`.
- **A buy-in can currently take a player into debt.** `DebitIdem` inherits
  `BLACKJACK_DEBT_LIMIT` (default −1000), so someone with an empty wallet can buy
  €1,000 of chips, win, and cash out while still €1,000 down. That is exactly what
  gogobee's Matrix blackjack already allows, so it is consistent rather than a bug —
  but a web casino runs far more hands, and this is the knob to turn if the economy
  starts leaking. A buy-in-specific floor of 0 is a two-line change.
- gogobee's blackjack taxes 5% of the *gross* payout into a community pot
  (`communityTax`). Pete's rake takes 5% of the *profit*. Deliberately different, and
  gentler; don't "fix" one to match the other without deciding which is right.

---

## 1. The three constraints everything else follows from

**gogobee owns the euros.** The ledger is `euro_balances` / `euro_transactions`
(gogobee `internal/db/db.go:1316,1324`), tied to the wider economy — adventure, shop,
lottery, mischief. Pete does not get a second wallet. Pete never writes a balance.

**gogobee has no inbound API and isn't getting one.** The only listening socket in the
whole repo is the Matrix appservice transaction endpoint (`internal/bot/appservice.go:255`).
Pete's own source says it plainly (`internal/web/roster.go:23`):

> Direction of travel is gogobee → Pete ... Pete has no route back into the game box's
> network and we are not opening one.

So gogobee stays the only initiator. It **polls** Pete for work and **pushes** results
back through the existing durable queue. Same as mischief (`gogobee_mischief_plan.md:191-197`).

**One binary.** Games live in the Pete process. gogobee already runs ~50 plugins and six
games in one process with in-memory table state and it's fine. Caddy points
`games.parodia.dev` at the same port; the mux branches on Host.

---

## 2. Identity — free, no link codes

MAS imports the Authentik `preferred_username` as the Matrix localpart
(`gogobee_mischief_plan.md:176-186`). So an Authentik session on Pete maps to a Matrix
user deterministically:

```
OIDC preferred_username  ->  strings.ToLower(u)  ->  @<u>:parodia.dev
```

Pete's `SessionUser` (`internal/web/auth.go`) carries `Sub`/`Name`/`Email` today. Add
`PreferredUsername` to the claims struct and the signed cookie payload. That is the whole
identity story.

Note the existing precedent: `email_nag.go:52` already asserts "Authentik usernames ==
Matrix localparts".

---

## 3. Money — session escrow, not per-hand settlement

### Why not settle each hand

Mischief is fire-and-forget: place an order, gogobee claims it within 30s, nobody cares.
A blackjack hand cannot work that way. If every bet round-trips through a poll loop you
wait half a minute to be dealt, and again for the payout.

### The model

Borrow the semantics hold'em already uses — `euro.Debit(..., "holdem_buyin")`
(`holdem.go:319`), `euro.Credit(..., "holdem_cashout")` (`holdem.go:371`) — and apply it
to the whole web casino:

1. **Buy in.** You convert euros to *chips* for a games session. One debit. Tolerates poll latency.
2. **Play.** Blackjack, UNO, hold'em, all at full speed against chips held in Pete's SQLite.
   Zero economy calls in the hot path.
3. **Cash out.** Chips convert back to euros. One credit. Tolerates the same latency.

Two economy touches per *session* instead of two per *hand*. Poll latency stops mattering.

### The invariant

> A euro is either in gogobee's `euro_balances` or in Pete's chip escrow. Never both.
> It moves between them only via a GUID-idempotent claim.

Pete's balance display is advisory only, sourced from the roster push and up to 2 minutes
stale. The authoritative check is `euro.Debit` at claim time. This preserves
`gogobee_mischief_plan.md:198-202` — *"Pete never writes a balance, so no double-spend surface."*

### The prerequisite: euro idempotency (BLOCKING)

`euro_transactions` (`db.go:1324`) has **no external id and no unique constraint**. `Debit`
is an atomic conditional UPDATE, but calling it twice debits twice. That is safe today only
because every caller is a Matrix message that arrives once. A *retrying poll loop* breaks
that: a claim that succeeds but whose ack is lost on the wire gets retried, and the player
pays twice.

**Before any of this ships:**

```sql
ALTER TABLE euro_transactions ADD COLUMN external_id TEXT;
CREATE UNIQUE INDEX idx_euro_tx_external ON euro_transactions(external_id)
  WHERE external_id IS NOT NULL;
```

plus `CreditIdem(userID, amount, reason, externalID)` / `DebitIdem(...)` in `euro.go` that
do the balance mutation and the transaction insert **in one tx**, and treat a unique-violation
on `external_id` as success-already-applied. Everything web-initiated goes through these.

---

## 4. The wire protocol

All new Pete endpoints are bearer-authed with the existing ingest token
(`internal/web/adventure.go:307` `bearerOK`). gogobee grows its first GET path in
`internal/peteclient/client.go` — the poll loop the mischief plan already calls for.

### Pete serves (gogobee polls, ~3s interval)

```
GET  /api/games/escrow/pending        -> [{guid, matrix_user, kind: buyin|cashout, amount}]
POST /api/games/escrow/claim          <- {guid}          idempotent, marks claimed
```

### gogobee pushes (existing peteclient queue, guid-idempotent)

```
POST /api/games/escrow/settled        -> {guid, ok: bool, reason?: "insufficient_funds", balance_after}
```

Reuse `pete_emit_queue` (`client.go:121-125`, `INSERT OR IGNORE` on `guid` PK) — it already
does durability, backoff and parking. Don't build a second queue.

### State machine (Pete side, table `game_escrow`)

```
requested -> claimed -> funded     (buyin ok; chips become spendable)
                     -> rejected   (insufficient funds; nothing spendable)
requested -> claimed -> settled    (cashout ok; chips destroyed, euros credited)
```

Poll interval 3s, not 30s: a player waiting to be dealt is watching a spinner. 3s of
"buying chips…" is acceptable; 30s is not.

### The reaper

Chips left in an abandoned session are euros in limbo. Auto-cash-out any session idle for
30 minutes. A crashed Pete must reconcile on boot: any `claimed` escrow with no `settled`
push gets re-polled by GUID.

---

## 5. Code reuse — copy, don't share

Separate modules, both mine, and the shells diverge (Matrix vs HTTP). Copy the pure cores
into `pete/internal/games/`, let them drift, no shared module.

### Verdict per game

| Game | Copy | Rewrite | Notes |
|---|---|---|---|
| **Hold'em** | ~2,700 LOC | the shell | The crown jewel. Take it all. |
| **UNO** | ~1,400 LOC | the turn engine | Great primitives, unshippable engine. |
| **Hangman** | ~250 LOC | loading/persistence | Clean rune-safe state machine. |
| **Blackjack** | ~95 LOC | everything else | 95 lines is the entire core. |
| **Trivia** | ~80 LOC | everything else | **No question bank exists.** |

### Hold'em — take almost all of it

Already mautrix-free, verified by import check:

- `holdem_cfr.go` (1,285) — full CFR trainer + NPC policy runtime, info-set packing into a
  `uint64`, regret pruning, board-texture/SPR/equity bucketing. Plus the trained
  `data/policy.gob` (3.4 MB) and `cmd/holdem-train`, `cmd/holdem-seed`. **This is the single
  highest-value asset in either repo.**
- `holdem_equity.go` + `holdem_equity_range.go` (548) — Monte-Carlo equity, equity-vs-range,
  draw/out detection. 100% pure, well tested.
- `holdem_betting.go` (383) — side pots, min-raise, all-in, street completion. The fiddly
  poker rules you do not want to rewrite. **Untested in gogobee — write tests as you port.**
- `holdem_game.go`, `holdem_eval.go`, `holdem_render.go`.

Entanglements to break (mechanical):
1. `id.UserID` → `PlayerID string` (`holdem_betting.go:283,314`; `holdem_eval.go` winnings maps).
2. Delete `RoomID`/`DMRoomID` from `HoldemGame` — table identity belongs to the shell.
3. Hoist the four `*time.Timer` fields out of `HoldemGame` (`holdem_game.go:92-95`).
4. `LoadPolicy(path)` does `os.Open` → `LoadPolicyFrom(io.Reader)`, so the policy can be `embed.FS`'d.

Hand evaluation is **not** homegrown — `holdem_eval.go:12` wraps `poker.Evaluate`. Just take
the `github.com/chehsunliu/poker` dependency.

### UNO — lift the primitives, rewrite the engine

Copy verbatim (already unit-tested in `uno_test.go`):
- `unoCard`/`unoColor`/`unoValue`, `canPlayOn`, `newUnoDeck`, draw/reshuffle (`uno.go:21-364`)
- The bot AI as free functions: `botPickCard`, `botPickNormal`, `botPickAggressive`,
  `botPickColor` (`uno.go:1465-1585`)
- `uno_nomercy.go` is ~90% pure: scoring, stacking rules, no-mercy deck, second bot.

**Rewrite the turn engine.** In gogobee the engine *is* the message sender —
`executeMultiTurn`, `applyAndAnnounce`, `handlePlayerPlay` mutate state and call
`p.SendReply(...)` mid-turn, and their `error` returns mean "send failed", not "illegal move".
There is no `ApplyMove(game, move) (Result, error)` seam anywhere. Disentangling that costs
more than rewriting it against the (good) primitives. One near-seam worth keeping:
`applyCardEffects` (`uno_multi.go:1459`) already returns a struct instead of sending.

### Hangman — take the struct

`hangmanGame` + `guessLetter`/`guessSolution`/`displayPhrase` + the `gallows [7]string` ASCII
art (`hangman.go:26-274`). Strip three fields (`participants`, `solvedBy`, `threadID`). Copy
`hangman_phrases.txt` (237 lines) and `embed` it instead of `os.Getenv("HANGMAN_PHRASE_FILE")`.
Drop the dreamclient translation path for v1.

### Blackjack — retype it

`handValue` (correct soft-ace demotion), `isBlackjack`, and their tests. That's it — 95 lines.
The rest is `bjTable` keyed by `id.RoomID` with timers embedded, and raw `db.Exec` SQL at
`blackjack.go:867`.

### Trivia — the question bank does not exist

`trivia.go:288` fetches from OpenTDB live, one question per round:

```go
apiURL := "https://opentdb.com/api.php?amount=1"
```

Reuse the category map (`trivia.go:24-53`) and `calculateScore` (time-decay, `:536`). For the
web version, **pre-fetch and cache a bank locally** — a per-question HTTP call in a web game
loop is a latency and rate-limit problem gogobee never had to care about at Matrix pace. Route
outbound fetches through Pete's `internal/safehttp` (SSRF guard).

Trivia has **no euro coupling today** (points only). Keep it that way in v1 — it's the one
game that can ship with zero escrow risk.

### Two things that apply to every copied engine

**Thread the RNG.** Every card game uses the `math/rand/v2` package global —
`blackjack.go:60`, `uno.go:186,277`, `holdem_game.go:102`, and throughout the CFR/Monte-Carlo
code. Nothing is seedable, which is why `TestBotPickCard_*` can only assert weak properties.
The adventure half of gogobee already does this right (`dnd_zone_combat.go:361` threads an
explicit `*rand.Rand` via `rand.NewPCG`). The card games never adopted it. **Threading
`rng *rand.Rand` through the deck constructors is mandatory, not optional** — ~20 call sites,
and it's the difference between a testable engine and one you can only smoke-test. It also
gives you a reproducible shuffle for dispute resolution.

**Hoist the timers.** `bjTable.joinTimer/turnTimer/reminderTimers`, `unoGame.idleTimer/warningTimer`,
`HoldemGame.actionTimer/warningTimer/idleTimer/idleWarningTimer` — all live inside the game
structs today. Timers are a shell concern. Game state must be a plain value you can serialize,
which is also what makes restart-mid-hand survivable.

### Build a `cards` package while you're at it

There is **no shared cards package in gogobee** — blackjack has its own deck
(`blackjack.go:32-75`), UNO has its own (`uno.go:130-189`), hold'em uses the third-party lib.
Consolidate into `pete/internal/games/cards` during the port rather than importing the
duplication.

---

## 6. Architecture in Pete

```
internal/games/
  cards/        shared deck primitives (new; consolidates gogobee's duplicates)
  blackjack/    pure engine  — ApplyMove(state, move) (state, events, error)
  holdem/       pure engine  + cfr/ (copied) + policy.gob (embedded)
  uno/          pure engine  (rewritten) over copied primitives + bots
  hangman/      pure engine  (copied) + phrases.txt (embedded)
  trivia/       pure engine  (new) + cached question bank
  escrow/       chip ledger, the gogobee poll/push seam
  table/        session, seating, turn clocks, reconnect — the shell
```

**Server-authoritative, always.** The browser sends intents and never sees the deck. Any
game with money attached cannot trust a client-reported result. This is why the engines have
to be Go on Pete's side rather than ported to JS.

**Every engine is a pure reducer**: `ApplyMove(state, move) (newState, []Event, error)`.
Timers, sockets and persistence all live in `table/`. That's the seam gogobee never had, and
it's what buys testability, replay, and surviving a redeploy.

### Transport

- **Blackjack, Hangman, Trivia, UNO-solo** — request/response over `fetch`. No sockets.
- **Hold'em, UNO-multi** — WebSocket. Lobby, seating, presence, turn clocks, reconnect-mid-hand,
  spectators. This is the bulk of the total effort, and it is the only genuinely new
  infrastructure in the project.

### Frontend

Pete has **no SPA and no bundler** today — server-rendered `html/template` + `embed.FS`, plain
`<script defer>` tags, npm present only to run the Tailwind CLI. games.parodia.dev is the first
real client-side app in the repo.

Precedent says this is survivable: `weather-gl.js` is 1,028 lines of hand-written WebGL2 with
no build step. Do the same here — vanilla JS per game, no framework, no bundler, Tailwind for
layout. Revisit only if it actually hurts.

### Auth

Session cookie is host-only today — `auth.go:151` sets `Path` but no `Domain`, so a
`news.parodia.dev` session will not travel to `games.parodia.dev`. Set `Domain: ".parodia.dev"`.
Note this widens the cookie to every parodia.dev host including the landing site — a deliberate
loosening, fine here, but not a freebie. Add the `games.parodia.dev` redirect URI to the `pete`
app in Authentik.

Games require login. No anonymous play — there's money in it.

---

## 7. Ship order

**Phase 0 — euro idempotency (gogobee).** `external_id` column + unique index +
`CreditIdem`/`DebitIdem`. Blocking; nothing else is safe without it.

**Phase 1 — escrow + Blackjack.** The full money loop against the simplest possible game
(95 lines of logic). Buy in, play, cash out. This proves cross-subdomain auth, the identity
mapping, the poll loop, the escrow state machine, the reaper, and the frontend shape — all
against a game where the *game* cannot be what's broken.

**Phase 2 — Trivia + Hangman.** No escrow (trivia has no euro coupling; keep hangman's
collaborative credit out of v1). Pure frontend and content work. Cheap wins, and they make the
site feel like a place rather than a demo.

**Phase 3 — UNO.** Solo first (single-player vs bot, no sockets). Then multi, which is where
the WebSocket infrastructure gets built. Forgiving latency, simple turn model — the right place
to learn multiplayer.

**Phase 4 — Hold'em.** Last. It's the hardest engine (side pots, all-ins, split pots), the
biggest port, and the one where collusion is a real threat rather than a theoretical one. Do it
when the multiplayer plumbing has already survived contact with real players.

---

## 8. Risks

**Economy inflation.** A web casino runs orders of magnitude more hands per hour than
Matrix-paced games ever did. Whatever the house edge is, it now compounds far faster in both
directions. Before Phase 1 ships, decide: session buy-in caps, a daily net-win/loss ceiling, or
a rake. This is the risk most likely to be discovered too late.

**Restart mid-hand.** Game state is in memory, so a Pete redeploy kills live tables — the same
property gogobee has today, and it redeploys far less often than Pete does. Mitigate with
serializable state (which the pure-reducer design gives for free) plus a drain-before-restart,
not a second process.

**Collusion in hold'em.** Two browsers, one person, one table. Not solvable in v1; at minimum
log seat/IP/session overlap so it's *detectable* after the fact.

**The gogobee contract is cross-repo.** `roster_test.go` already guards it: an unknown
`event_type` is a 400 that makes gogobee's sender park the row. Add the same guard on the new
escrow endpoints, and keep the payload structs in step across both repos by hand — that's the
cost of copying instead of sharing, and it's the right trade here.

---

## 9. Open questions

- **Chips 1:1 with euros, or a separate denomination?** 1:1 is simpler and honest. A separate
  denomination gives you a knob for the inflation problem.
- **Do web results feed the Matrix room?** Pete already has a priority poster
  (`adventure.go:151`). "Reala just took a 12k pot" is a good bulletin, and this is nearly free.
- **NPC opponents at the web tables?** The CFR bot is right there and it's good. It also means
  a table never sits empty, which matters a lot for a small community.