fix: remove Rails-isms — platform-agnostic templates and checklist

- review/checklist.md: multi-framework examples (Rails/Node/Python/Django)
- plan-ceo-review: framework-agnostic grep + generic error table
- plan-eng-review: "corresponding test" not "JS or Rails test"
- CLAUDE.md: Platform-agnostic design principle + Testing section

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

CLAUDE.md

@@ -30,6 +30,17 @@ on `git diff` against the base branch. Each test declares its file dependencies
 llm-judge, gen-skill-docs) trigger all tests. Use `EVALS_ALL=1` or the `:all` script
 variants to force all tests. Run `eval:select` to preview which tests would run.
 
+## Testing
+
+```bash
+bun test             # run before every commit — free, <2s
+bun run test:evals   # run before shipping — paid, diff-based (~$4/run max)
+```
+
+`bun test` runs skill validation, gen-skill-docs quality checks, and browse
+integration tests. `bun run test:evals` runs LLM-judge quality evals and E2E
+tests via `claude -p`. Both must pass before creating a PR.
+
 ## Project structure
 
 ```
@@ -79,6 +90,18 @@ SKILL.md files are **generated** from `.tmpl` templates. To update docs:
 To add a new browse command: add it to `browse/src/commands.ts` and rebuild.
 To add a snapshot flag: add it to `SNAPSHOT_FLAGS` in `browse/src/snapshot.ts` and rebuild.
 
+## Platform-agnostic design
+
+Skills must NEVER hardcode framework-specific commands, file patterns, or directory
+structures. Instead:
+
+1. **Read CLAUDE.md** for project-specific config (test commands, eval commands, etc.)
+2. **If missing, AskUserQuestion** — let the user tell you or let gstack search the repo
+3. **Persist the answer to CLAUDE.md** so we never have to ask again
+
+This applies to test commands, eval commands, deploy commands, and any other
+project-specific behavior. The project owns its config; gstack reads it.
+
 ## Writing SKILL templates
 
 SKILL.md.tmpl files are **prompt templates read by Claude**, not bash scripts.