Fix #303: Smoke hook template through installer

[flyingrobots]

What changed

Replaced literal post-merge template integrity assertions with a real-template HookInstaller smoke test.

Why

The old suite line-matched the checked-in shell template. The new coverage stamps the real template through the installer, classifies the installed hook, appends it to a foreign hook, upgrades the appended section, and reads status through the installer.

Closes #303

Validation

• npx vitest run test/unit/domain/services/HookInstaller.test.ts
• npm run typecheck:test -- --pretty false

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 17617c39-80b0-4423-9847-b67f6fcb36a7

📥 Commits

Reviewing files that changed from the base of the PR and between a21fb8b and 9191867.

📒 Files selected for processing (1)

• test/unit/domain/services/HookInstaller.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-303-hook-installer-smoke

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[github-actions]

Release Preflight

• package version: 18.0.0
• prerelease: false
• npm dist-tag on release: latest
• npm pack dry-run: passed
• jsr publish dry-run: passed

If you tag this commit as v18.0.0, release workflow will publish.

[flyingrobots]

@codex Code Lawyer Activity Summary

Issue	Severity	Source	File	Outcome
No actionable self-discovered issue found in this PR diff.	None	Self	PR diff against origin/main	No code changes made.

Validation:

Check	Result
GraphQL review-thread audit	0 unresolved, non-outdated review threads
GraphQL review audit	0 Changes Requested reviews
git diff --check origin/main...origin/fix-303-hook-installer-smoke	Pass
Added hard-ban token scan	Hard-ban diff scan found no actionable additions.