chore(memory): BDR-081 + LRN-139 + journal + CHANGELOG + plan (opus5 tuning)

Capitalizes the Claude-5-family config recalibration: decision record,
trait-inversion learning (LRN-030 superseded premise, #80988 injections,
no-effort-hold trap), journal line, CHANGELOG Unreleased entries, and the
challenged plan (3 blind Opus 5 lenses, synthesis in §5bis).

.claude/memory/decisions.md

@@ -1073,3 +1073,6 @@ Audit (user ask "profile toggles externals both ways?"): ASYMMETRIC. Enable side
 
 ### BDR-080 — bug routing inverted: /bugfix primary, /investigate explicit-only [accepted] (2026-07-21)
 Old routing "Bug → investigate (bugfix if gstack off)" + gstack ON by default → every bug took path bypassing own quality pipeline (gitflow aiguillage, contract, fresh verifier + security gates, doc-sync, `.claude/memory` registries) — /bugfix relegated to near-never fallback. Skill comparison: same core doctrine (root-cause iron law, hypothesis loop, regression test, 3-strike stop, >5-files alert) but incompatible wrappers — investigate monolithic (same context investigates+fixes+verifies, ~1075-line SKILL.md w/ gstack preamble/telemetry/onboarding, capitalizes to `~/.gstack` learnings.jsonl framework never reads at session start); bugfix orchestrator (reflection inline, sonnet bugfixer executor, fresh gates — BDR-066, LRN-083). Composition rejected: skills superpose in context, don't compose — invoking investigate inside bugfix = two full workflows, two completion protocols, two memory systems loaded at once. Decision: CLAUDE.global.md routing line inverted — bugfix primary; investigate ONLY on explicit ask for gstack ecosystem (cross-project learnings, /freeze scope lock, long no-commit investigation). Alternatives rejected: keep investigate primary (bypasses framework), embed investigate inside bugfix (context conflict, dual memory). Known drift noted at write time: Index table rows BDR-074..079 missing (pre-existing, /prune-memory scope).
+
+### BDR-081 — Config recalibrated for Claude 5 family (Opus 5 dispatch tier) [accepted] (2026-07-30)
+Opus 5 (released 2026-07-24) now backs every `model: opus` pin (BDR-076/077) + any `/model opus` session. Research (official migration guide + web + registries): Opus 5 OVER-delegates (inverts LRN-030 Opus 4.8 trait that CLAUDE.global.md:43-47 compensated), self-verifies (explicit verify instructions → over-verification, "removing them reduces wasted tokens with no loss in quality"), literal following (conservative-reporting clauses depress recall; MUST/CRITICAL over-triggers), scope expansion = named regression, written deliverables +30-40%. Claude Code injects Opus-5-only anti-delegation prompt sections (heron_brook + subagent_steer_delegation, issue #80988, server-gated, no opt-out) — prose caps would triple-stack. Shipped: delegation block → model-neutral WHEN-guidance + explicit gates carve-out (verifier/security/challenge still dispatch as written); "staff engineer" self-check bar dropped; finish-whole-task clause folded into Deviations (gone-WRONG→STOP still wins); deliverable-length rule; design hook `\bux\b` dropped (`\bui\b` KEPT — 0 FP, 1 logged TP, lock-tested); plan-challenger grounded-doubt→[MINOR] in-place reword (grammar byte-identical). Plan challenged by 3 blind Opus 5 plan-challengers: correctness CONCERNS(4) / robustness FATAL(5, BLOCKER: all surfaces symlink-deployed LIVE — gates fire post-deployment) / simplicity CONCERNS(4); every fix adopted as prescribed (scratch-validation before live hook write, minimal diffs, ux-only, MINOR-routing). Alternatives rejected: leave as-is (nudge actively counter-productive); hard spawn caps in prose (harness injects one); confidence axis on challenger grammar (consumer unwired); dropping \bui\b (no evidence). NOT touched: verify-secure-loop + fresh gates (harness architecture BDR-049/050, ≠ model self-check prose); Security/Architecture sections (BDR-021); settings effortLevel xhigh (user pref — Opus 5 carry-over trap → LRN-139); superpowers plugin wording (external upstream). Plan+synthesis: .claude/tasks/plans/2026-07-30-opus5-config-tuning-1238.md. Branch feature/opus5-config-tuning, unmerged (human gate).

.claude/memory/journal.md

@@ -427,3 +427,6 @@ rules:
 ## 2026-07-22
 - User: auto-gitignore+delete transient pipeline artifacts in all projects. Investigation reframed the ask — gitignore = WRONG tool (files read from disk during run; would break superpowers SDD `git add` of spec). BDR-065 already rejected gitignore + its DELETE side was doctrine-only (no code, manual chore slipped once — 655e364). User picks (2 recommended): keep committed-during-run + AUTOMATE delete; keep `.claude/tasks/{contracts,plans}` versioned.
 - Built `lib/gitflow.sh` `_gitflow_purge_transient` at finish (feature/bugfix, pre-merge, best-effort never-abort, opt-out `GITFLOW_PURGE_TRANSIENT=0`) + `purge-transient` CLI verb. Universal via `~/.claude/lib`→repo symlink. gitflow-test T17 a-d (10 checks, `--full-history` recovery), shellcheck clean, make test exit 0. BDR-065 amendment + [[LRN-138]]. feature/gitflow-auto-purge-transient.
+
+## 2026-07-30
+- User: Opus 5 "needs more freedom" → analyse config + adapt. Research 3-agent (registries / config audit / web) + official migration guide: over-delegation (inverts LRN-030), over-verification, literal following, scope expansion, #80988 injections. Plan challenged 3 blind Opus 5 plan-challengers — robustness FATAL (BLOCKER: symlink-live deployment), all fixes adopted. Shipped: CLAUDE.global.md recalibrated (delegation when-guidance, staff-bar dropped, finish-whole-task, deliverable-length; 308/320), design hook \bux\b dropped flip-tested (22/0), plan-challenger grounded-doubt→[MINOR] (44/0). BDR-081 + LRN-139. feature/opus5-config-tuning, UNMERGED.

.claude/memory/learnings.md

@@ -1355,3 +1355,9 @@ rules:
 - **context**: user asked to gitignore transient planning artifacts (`docs/superpowers/{specs,plans}`, `.claude/tasks/{contracts,plans}`) to stop them merging. BDR-065 had already REJECTED gitignore for docs/superpowers on the git-travel ground; the real gap was the DELETE side never being coded (doctrine-only manual chore, slipped once — 655e364). Built `_gitflow_purge_transient`.
 - **future application**: "don't merge transient X" → ask: does the run read X from disk? does X travel via git (worktree, foreign checkout)? Yes → auto-purge at finish, not gitignore. Scoped commit `-- <paths>` avoids sweeping a dirty index; `git diff --quiet HEAD -- paths` precheck makes `git rm` all-or-nothing safe; keep the purge best-effort so cleanup NEVER blocks a merge. Prove archive-reachability with `git log --full-history` / `git show <sha>:path` — plain `git log -- path` prunes the purged add-commit via history simplification (bit me writing T17).
 - **link**: [[BDR-065]].
+
+## LRN-139 — model-trait compensations invert across generations; state WHEN-guidance, not direction (2026-07-30)
+- **pattern**: config rules that COMPENSATE a model trait become counter-productive when the next generation inverts the trait. LRN-030 (Opus 4.8 under-delegates → "Default to delegation… counters under-delegation") inverted by Opus 5 (delegates MORE readily, official guide) — the rule pushed the failure the model now has. Same class: explicit verify instructions → over-verification; conservative-reporting clauses → literal recall suppression; MUST/CRITICAL → over-triggering.
+- **Opus 5 traps found**: (a) Claude Code injects Opus-5-only anti-delegation prompt sections (heron_brook + subagent_steer_delegation, issue #80988; server-gated, no opt-out, absent from transcripts) — own prose stacks on top blindly; (b) NO model-default effort hold on Opus 5 — persisted effortLevel (xhigh, settings.json) silently carries over, against "start high, sweep low/medium"; run /effort sweep per model; (c) effort does NOT shorten visible output/deliverables — only prose length rules do (+30-40% docs).
+- **future application**: at every model-generation bump, grep config for trait-compensating language ("counters model tendency…", "default to X") and re-verify the premise; prefer WHEN-guidance (conditions where X pays) over directional nudges — survives inversions unchanged.
+- **link**: [[LRN-030]] [[BDR-081]].