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trait-inversion learning (LRN-030 superseded premise, #80988 injections,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).