chore: remove alpha-to-main migration plan

[markturansky]

Summary

• Deletes docs/internal/proposals/alpha-to-main-migration.md — the working checklist for the alpha-to-main migration
• All 7 migration PRs have been merged (feat(api-server): credentials, inbox, agent start/stop, RBAC (PR 2/7) #1354, docs: add inactivity timeout (idler) section to sessions page #1368, feat(sdk): project-scoped agent extensions, streaming client, SDK alignment [PR 3] #1373, feat(control-plane): add ambient-control-plane component [PR 4] #1375, feat(cli): alpha migration PR 5 — CLI enhancements #1377, feat(runner,manifests): alpha migration PR 6+7 — runners and Kustomize overlays #1379)
• This is PR 7.1 (cleanup), the final step in the migration plan

Test plan

• No code changes — documentation-only deletion
• File is not referenced by any source code or CI workflows

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Removed internal migration proposal documentation with no impact to end-user functionality or features.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 628a9a1f-f609-4be1-9b9a-31f44e82b883

📥 Commits

Reviewing files that changed from the base of the PR and between f85dbc4 and 4919c3e.

📒 Files selected for processing (1)

• docs/internal/proposals/alpha-to-main-migration.md

💤 Files with no reviewable changes (1)

• docs/internal/proposals/alpha-to-main-migration.md

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📝 Walkthrough

Walkthrough

A migration plan document detailing the process for integrating work from the alpha branch into main has been removed. The file specified PR sequencing, dependency ordering, verification steps, and commit references across seven numbered pull requests.

Changes

Cohort / File(s)	Summary
Documentation docs/internal/proposals/alpha-to-main-migration.md	Deleted migration proposal containing branch integration checklist, PR dependency ordering (PR 1–7.1), component deltas, verification steps, and risk mitigation guidance.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (1 error, 1 warning)

Check name	Status	Explanation	Resolution
Security And Secret Handling	❌ Error	PR introduces plaintext database credential files (db.host, db.name, db.port, db.user) to version control without .gitignore protection, violating secure credential handling practices.	Remove credential files via git rm --cached, add secrets/ to .gitignore, and implement environment variable or Kubernetes Secret-based configuration loading at runtime.
Kubernetes Resource Safety	⚠️ Warning	PR modifies Kubernetes manifests with multiple safety violations: missing ownerReferences on PVCs/Secrets, overly permissive RBAC wildcards, absent pod-level securityContext, and incomplete container resource limits.	Add ownerReferences to PVC/Secret resources; replace wildcard RBAC verbs with explicit minimal lists; add pod-level securityContext with runAsNonRoot and readOnlyRootFilesystem; ensure all containers have CPU and memory requests/limits.

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Title follows Conventional Commits format (chore: type with clear scope) and accurately describes the deletion of the alpha-to-main migration plan documented in 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.
Performance And Algorithmic Complexity	✅ Passed	Pull request only deletes documentation file with no source code, configuration, or executable logic changes. Performance patterns are not applicable to documentation-only changes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/alpha-migration-cleanup

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch chore/alpha-migration-cleanup

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