feat: adaptive gating + cross-review dedup for review army (v0.15.2.0) (#760)

* feat: add test_stub optional field to specialist finding schema

All specialist prompts now document test_stub as an optional output field,
enabling specialists to suggest test code alongside findings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: adaptive gating + test framework detection for review army

Adds gstack-specialist-stats binary for tracking specialist hit rates.
Resolver now detects test framework for test_stub generation, applies
adaptive gating to skip silent specialists, and compiles per-specialist
stats for the review-log entry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: cross-review finding dedup + test stub override + enriched review-log

Step 5.0 suppresses findings previously skipped by the user when the
relevant code hasn't changed. Test stub findings force ASK classification
so users approve test creation. Review-log now includes quality_score,
per-specialist stats, and per-finding action records.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: bump version and changelog (v0.15.2.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: bash operator precedence in test framework detection

[ -f a ] || [ -f b ] && X="y" evaluates as A || (B && C), so the
assignment only runs when the second test passes. Wrap the OR group
in braces: { [ -f a ] || [ -f b ]; } && X="y".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.15.6.0",
+  "version": "0.15.8.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",