UX review: correct the item 3b handoff advice

The previous handoff sent the next session off to read
feat/mechanics-deterministic-pass and feat/calm-suggestions as unmerged
branches. Both are in main and have been for a while — that came from
misreading `git branch -vv` tracking info as merge status.

It matters because it inverts the advice. The deterministic rules engine
(prose.ts) already ships, already emits exact-span fixes as suggestion
cards under a 'mechanics' family, and already suppresses re-edits of
settled sentences. So item 3b's remaining work is most likely the
latency/ordering half — render local hits before the LLM pass — not
writing a rules engine. Point at the code and the two commits instead.

Same for item 5: internal/suggestions/translate.go already exists.

Also record that every topic branch was fully merged and has now been
deleted locally and on origin; main is the only branch left.

Claude-Session: https://claude.ai/code/session_016y6gyuHkQXPiEuW8RGQyua

UX_REVIEW_2026-07-27.md

@@ -289,15 +289,34 @@ if you're comparing against memory of the live site, that's why.
 reproducible) and item 5's original premise (re-scoped, much cheaper now).
 **Untouched:** items 2, 3, 4, 6, 7, 8.
 
-**Suggested next:** item 3b, the instant local rules layer — best
-value-for-effort left, no server work, and it's the item that most matches
-the "LLM is garnish" ethos. **Check `web/src/components/Companion/
-grammarLite.test.ts` first** — a rules engine may already be half-built,
-and there are sibling branches that look relevant and were never merged:
-`feat/mechanics-deterministic-pass` ("deterministic mechanics suggestion
-family, rule-based, no LLM") and `feat/calm-suggestions` ("suppress fickle
-re-edits of sentences the user already settled", which reads like a
-partial item 2). Read those before writing anything new.
+**Suggested next:** item 3b, the instant local rules layer — but it is
+**largely already built, in `main`**, and the item as written doesn't know
+that. Before writing any rules engine, read:
+
+- `web/src/components/Companion/prose.ts` — the deterministic rules engine,
+  client-side, already the single source of non-LLM detection. Sibling
+  tests: `prose.test.ts`, `grammarLite.test.ts`.
+- Commit `96f68a9` ("Add deterministic mechanics suggestion family,
+  rule-based, no LLM"). Applyable rules already emit exact-span
+  `original -> replacement` fixes that surface as suggestion cards, under
+  a `mechanics` family persisted via `POST /docs/{id}/mechanics`;
+  awareness-only rules (run-ons, splices) stay companion bubbles, and the
+  companion hides fix-bearing hints so a span is never both.
+- Commit `9d2501a` ("Suppress fickle re-edits of sentences the user already
+  settled") — a partial item 2 that also already shipped.
+
+So item 3b's real remaining work is probably not "write the rules" but
+"make the existing local hits render *immediately*, before the LLM pass,
+with a modest style" — i.e. the latency/ordering half of the item, plus
+whatever rules `prose.ts` is missing. Scope it against the code, not
+against the item text.
+
+Item 5 likewise: `internal/suggestions/translate.go` already exists — read
+it before designing a `translate` suggestion type.
+
+(An earlier draft of this handoff claimed those two commits sat on
+unmerged branches. They don't; both are in `main`. That came from
+misreading `git branch -vv` tracking info as merge status.)
 
 **Verification technique, for whoever picks up items 2/3/7.** Claims about
 editor behaviour in this doc should be checked against the running build,
@@ -311,8 +330,9 @@ first through the fiber tree for an object with `.view`/`.state`/
 `view.dispatch` logging `tr.docChanged` are enough to settle most
 "does the editor really do X" questions in a couple of minutes.
 
-**Housekeeping:** `fix/companion-yields-to-cards` is merged and can be
-deleted. Testing item 1 meant accepting suggestions on her live document;
+**Housekeeping:** every topic branch in the repo was fully merged into
+`main` and they have all been deleted, locally and on origin. Testing
+item 1 meant accepting suggestions on her live document;
 the one residual edit was reverted ("on foot" → "by foots") and the doc
 text is as it was found, but the History panel now shows several extra
 auto-snapshots from that session.