chore(memory): EVAL-006 + LRN-046/047/048 + journal — prune-memory v1.1 TDD

Capitalizes the prune-memory v1.1 TDD (skill 0a3e766):
- EVAL-006: 6 dangers TDD-closed, validated on the real learnings.md
  (0 fidelity false-positive vs 13); honest limits (SAFE != USEFUL, RED-7/8 open).
- LRN-046 deterministic oracle > semantic judge on destructive skills.
- LRN-047 a noisy safety guard (13/13 FP) is a risk, not discomfort.
- LRN-048 a "0/OK/pass" must prove it looked (counted both sides).
- journal: one line under 2026-06-25.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W9sqAwZxBMZSynZoVrEJhd

.claude/memory/journal.md

@@ -198,3 +198,4 @@ rules:
 - Edit/Write refuse write-through-symlink → resolve real path (`readlink -f`); `~/.claude/CLAUDE.md` → repo. LRN-044.
 - Inspected dirty gstack submodule (parent showed `m`): `package.json`+`bun.lock` = the Playwright 1.58.2→1.61 bump (BDR-029/BLK-008), NOT restore noise → left intact, NOT cleaned, NOT committed (submodule ref stays at clean 070722ace; local patch re-applied by installer by design).
 - Renamed skill `/validate` → `/web-validate` (user-surface only): git mv + name + H1 + CLAUDE.md routing + 6 profiles (functional) + cross-refs + agent dispatch + README/USAGE. KEPT: `validator-analyzer` name (lockstep), `.validate-cache`/`VALIDATE.md` (audit-file family), `.claude/` history (append-only), NL triggers. Critical catch: client-deliverable leak-guard regex (`client-handover-writer.md:1462`) matched `/validate` by exact token — `web-` prefix broke the anchored match → extended to `web-validate|validate` (covers legacy docs). Verified complete: `/validate` 0 in active code, `html-validate` 15 intact, regex shows both. Commits e5e673a + dbab542 (BDR-032/LRN-045) + a1cc753 (TODO L167 annotated additively). gstack submodule untouched.
+- TDD'd `/prune-memory` (only destructive skill, untested + carried a false `Fixed in v1.1 (TDD found it)` claim): 6 dangers (RED-1..6) closed by deterministic guards, skill `0a3e766`. Real-data run on learnings.md exposed SAFE≠USEFUL (compression marginal on dense; value = index/merge, not C) + a 13/13-false-positive line-grep fidelity guard → replaced by a per-entry count census (0 FP, proven counting both sides). RED-7 (example-priming) + RED-8 (added-negation) filed in BACKLOG. EVAL-006, LRN-046/047/048.