feat(T-28): add auto-merge, ready-to-merge comment and notification to auto-implement workflow

[raschmitt]

Task/Issue

T-28 · Auto-merge automation-driven PRs

What?

• Add Find created PR step to capture PR metadata from the gh CLI after the agent creates the PR
• Add Phase 1 step that posts a "Ready for review" comment tagging the repo owner for manual review
• Add Phase 2 step that enables auto-merge with squash strategy using a Conventional Commits subject
• Add summary notification step that posts what was implemented and CI status as a PR comment

Why?

• Automation PRs need a manual review phase before auto-merge builds confidence (phase 1)
• Auto-merge reduces the latency between CI passing and merge, keeping the pipeline moving (phase 2)
• Conventional Commits format ensures merge commit messages are consistent with project standards
• A final notification comment gives the repo owner a clear summary of what was implemented and CI status

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[raschmitt]

🤖 This PR was automatically generated by the auto-implement workflow using OpenCode CLI with the big-pickle model.

[raschmitt]

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Reviewed commit: 2b6d0b7698

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This review was generated automatically by the AI Code Review workflow using OpenCode CLI with the Minimax M2.5 Free model.

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