chore(gitignore): ignore L3 self-dogfood artifacts (.githooks, l3-stability.yml)

[broomva]

What

Adds .githooks/ and .github/workflows/l3-stability.yml to the bstack repo's self-dogfood .gitignore block (alongside the already-ignored .control/ + .claude/).

Why

Surfaced while validating v0.22.0 (#65) on the bstack repo itself: running bstack bootstrap / install-rcs-stability against the source repo scaffolds .githooks/pre-commit + .github/workflows/l3-stability.yml. The source repo uses .github/workflows/ci.yml + .git/hooks (its core.hooksPath), so those are generated artifacts that should never be committed — same class as .control/ and .claude/. Before this, every self-dogfood run left two untracked files polluting git status.

Verification (P11)

• ✅ .githooks/pre-commit + .github/workflows/l3-stability.yml → now ignored.
• ✅ Real tracked CI (ci.yml, release.yml, validate-release.yml) → not ignored (the rule is scoped to l3-stability.yml specifically, not all of .github/workflows/).
• ✅ Fresh bstack bootstrap on the bstack repo that creates both artifacts → git status shows only the .gitignore change, no pollution.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated internal configuration to ignore locally generated development artifacts from bootstrap and installation workflows.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 14195f60-82b6-4846-83fc-97ac085caaf5

📥 Commits

Reviewing files that changed from the base of the PR and between ccbf530 and 314a3b8.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Walkthrough

This PR extends .gitignore to ignore locally generated scaffolding artifacts from bstack's bootstrap/doctor/install-rcs self-dogfood workflow, including .control/, .claude/, .githooks/ directories and the generated .github/workflows/l3-stability.yml file.

Changes

Installer scaffolding ignore

Layer / File(s)	Summary
Installer artifacts in gitignore .gitignore	New entries and comments ignore the .control/, .claude/, .githooks/ directories and .github/workflows/l3-stability.yml file that are generated locally by the bstack self-dogfood installer workflow.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A tidy .gitignore, oh what a sight,
Scaffolding artifacts bundled just right,
.control/, .claude/, and .githooks/ too,
Gone from the repo, kept out of view! 📦✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding L3 self-dogfood artifacts to gitignore, with concrete examples (.githooks, l3-stability.yml) that match the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gitignore-l3-dogfood-artifacts

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