docs(phase-25): R31 confirmed by Drew (binding) — strategic-pivot capture discipline

docs/decision-log.md

@@ -18,7 +18,7 @@ The quantitative curve (fleet % over time) is safe in git + the PhaseEnds foreve
 "we tried X, it was a dead end because Y, so we turned to Z" — is what evaporates between sessions. So it
 is logged here as it happens.
 
-**Discipline (R31 — proposed Phase 25).** **Forward-only.** Do NOT backfill historical pivots from
+**Discipline (R31 — confirmed by Drew 2026-07-08, Phase 25).** **Forward-only.** Do NOT backfill historical pivots from
 compressed summaries — that reproduces exactly the low-quality reconstruction R30 exists to prevent (the
 PhaseEnds/cookbook already hold what was captured fresh at the time). Log each NEW strategic pivot during
 the session that produced it. Route TECHNICAL idioms to the cookbook; this file is for direction/judgment.

phase-ends/CURRENT_PHASE.md

@@ -216,8 +216,8 @@ NOT closing — the curriculum + 127-draftable exemplar-cracking is the phase's
 - **If context compacts mid-train:** check `.run/train_v4.log` for `train_runtime` (done) or a Traceback (failed);
   if `models/bfm-match-7b-v4/adapter_model.safetensors` exists, training finished — proceed to eval.
 
-## RULES PROPOSED THIS PHASE (ratify at PhaseEnd — P10)
-- **R31 — Capture the WHY behind strategic pivots in `docs/decision-log.md`, while fresh.** At each major
+## RULES ADDED THIS PHASE (transcribe to the PhaseEnd Rules table at close)
+- **R31 — CONFIRMED by Drew 2026-07-08 (binding now).** Capture the WHY behind strategic pivots in `docs/decision-log.md`, while fresh. At each major
   direction change / dead-end / reversal, log (during the producing session): context+belief → what was
   tried that failed → the pivot → the byte/measurement-grounded why → a hindsight "better path" note.
   Extends R30 (which covers TECHNICAL artifacts — cookbook idioms, byte-verified findings, distillations)