Keep builder prompt out of git commits

[s-hiraoku]

Summary

• replace the builder prompt commit instruction with workspace-only guidance
• keep push/gh/PR creation prohibited for the builder
• add a regression test that prompt ownership for commits stays with kaizen-loop

Verification

• npm run typecheck
• npm test

Closes #139

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Repository: kaizen-agents-org/coderabbit/.coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d1ab5256-386b-411d-93b4-7e5737bb3f8d

📥 Commits

Reviewing files that changed from the base of the PR and between 4d72bf2 and 6fc7db4.

📒 Files selected for processing (2)

• src/agents/prompt.ts
• test/agent.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/builder-prompt-no-commit

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[s-hiraoku]

Guardian check complete.

• CI: passing (verify)
• CodeRabbit: status success; no actionable review threads were created (review limit notice only)
• Merge state: CLEAN
• Closing linkage: Closes #139 is recognized by GitHub