D&D: class-balance Phase 1 — full 10×30 measurement matrix

Generalizes the Phase 0 spike harness to the full build matrix the
class-balance doc plans for. No tuning yet — just measurement.

- classBalanceProfile gains Subclass; buildHarnessCharacter sets it on
  the synthetic DnDCharacter; buildHarnessPlayer now calls
  applySubclassPassives after class+race passives, matching live order
  (combat_bridge.go, combat_session_build.go). Subclass="" is a no-op,
  so L1–L4 pre-unlock rows are unaffected.
- buildPhase1Profiles yields 190 rows: 10 classes × 4 pre-subclass
  levels (L1–L4) + 10 classes × 3 subclasses × 5 post-unlock checkpoints
  (L5/7/10/15/20). Order is registry order so output reads like the
  design doc / !class help.
- TestClassBalance_Phase1_FullMatrix runs the matrix at 200 trials/cell
  (~5.5s) and logs every cell plus a per-class tier-mean summary with
  min/max range. Only harness-broken pathologies fail the test (0% at
  T1 anywhere, or 100% at T5 for an L1 build); per-tier parity bands
  land in Phase 2 once we have data to calibrate the tolerance.

Phase-2 baseline from this run: at T4 the cross-class spread of mean
win rate runs Bard 0.62 → Fighter 0.80 (~18pp); at T5 0.48 → 0.64
(~16pp); casters trail martials at the post-unlock tier (T3) by ~20pp.

Phase 0 test (TestClassBalance_Phase0_FighterVsMage) still green with
identical numbers — the additional applySubclassPassives call is a
no-op for Subclass=="".

gogobee_class_balance.md

@@ -86,9 +86,16 @@ HP-remaining, and near-death-rate are logged as diagnostics, not asserted.
 - **Phase 0 — spike.** Harness skeleton; equipment + spell-selection policies;
   run *Fighter vs. Mage only* across tiers and sanity-check plausibility
   (both win something; casters not at 0%). If the numbers are implausible, fix
-  the policies before trusting anything. **← current**
+  the policies before trusting anything. **Done — commit 0878b4e.**
 - **Phase 1 — harness + matrix.** Generalize to all 10 classes × 30 subclasses;
   `TestClassBalance` logs the full report. No tuning yet — just measurement.
+  **Done.** Subclass field plumbed through the harness, `applySubclassPassives`
+  wired in to match live combat order, `buildPhase1Profiles` produces 190 rows
+  (10 × 4 pre-subclass + 10 × 3 × 5 post-subclass), `TestClassBalance_Phase1_FullMatrix`
+  logs the cells plus per-class tier means and ranges. Phase-2 calibration baseline:
+  at T4 the cross-class spread of *mean* win rate runs Bard 0.62 → Fighter 0.80
+  (~18pp); at T5 0.48 → 0.64 (~16pp); casters trail martials at the post-unlock
+  tier (T3) by ~20pp. **← current**
 - **Phase 2 — tuning pass.** Adjust the levers (class passives → subclass tiers
   → spell dice → AC floor → attack bonus, in that order) until the parity band
   holds. Lock the band into the test assertion.