test(investigate): pin the web-search guard; changelog size (adversarial review)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

changelog.d/gsta251-investigate-drop-steps.md

@@ -1,2 +1,2 @@
-- **`/investigate` drops its five-phase step procedure** (GST-938). Harness Evals watched Opus 5.5 run `/investigate` on 46 bug-fix sessions: the procedure loaded every time and the model followed none of its steps (0 of 30 with Claude Code's real system prompt), while a gstack session cost $0.46 against $0.22 without gstack (HARN-14, gn-hard-follow-2026-11). The skill keeps the parts that still do a job. Those are the Iron Law, the arguments table, a short "How to work" with the three lessons that cost real time before (read call sites before calling two paths duplicates, refresh the git index before timing, test a shared premise before a third fix), the 3-strike and more-than-5-files asks, the Scope Lock with its freeze hooks, the recipes and `--backlog`, the prior-learnings search and the DEBUG REPORT. The generated Claude skill shrinks from 29.8 KB to 20.1 KB. Gone: the Phase 1-5 walkthrough, the pattern table, the web-research block and the hypothesis-keyed learnings re-pull. The research block's rule stays as a guard, so a web search names the error class and library, never raw error text, hostnames, paths or secrets. BROWSER.md and docs/skills.md now describe the short skill.
+- **`/investigate` drops its five-phase step procedure** (GST-938). Harness Evals watched Opus 5.5 run `/investigate` on 46 bug-fix sessions: the procedure loaded every time and the model followed none of its steps (0 of 30 with Claude Code's real system prompt), while a gstack session cost $0.46 against $0.22 without gstack (HARN-14, gn-hard-follow-2026-11). The skill keeps the parts that still do a job. Those are the Iron Law, the arguments table, a short "How to work" with the three lessons that cost real time before (read call sites before calling two paths duplicates, refresh the git index before timing, test a shared premise before a third fix), the 3-strike and more-than-5-files asks, the Scope Lock with its freeze hooks, the recipes and `--backlog`, the prior-learnings search and the DEBUG REPORT. The generated Claude skill shrinks from 29.8 KB to 20.2 KB. Gone: the Phase 1-5 walkthrough, the pattern table, the web-research block and the hypothesis-keyed learnings re-pull. The research block's rule stays as a guard, so a web search names the error class and library, never raw error text, hostnames, paths or secrets. BROWSER.md and docs/skills.md now describe the short skill.
 - Behavior change: the model is no longer told to work through Phases 1-5 in order, and `/investigate` no longer carries the Aside web-research block. Hook-enforced versions of the two steps that could change results (reproduce first, verify after) are planned as an opt-in Claude Code candidate that ships only if a preregistered eval shows it helps.

test/investigate-recipes.test.ts

@@ -107,6 +107,7 @@ describe('recipe tokens', () => {
     const recipes = skeleton.slice(skeleton.indexOf('## Recipes'), skeleton.indexOf('## Report'));
     expect(recipes).toContain('sections/blast-radius.md');
     const how = skeleton.slice(skeleton.indexOf('## How to work'), skeleton.indexOf('## Scope Lock'));
+    expect(how).toMatch(/search the generic error class, library and version, never the raw error text, hostnames, IPs, file paths, SQL, customer data or secrets/);
     expect(how).toMatch(/Two fixes that shared one premise failed the same gate — write the premise down in one sentence and test it before a third fix/);
   });
 });