[schemas] Thought lifecycle receipt log

[Nev-Harris]

Contribution Type

• Schema (/schemas)

What does this do?

Adds schemas/thought-lifecycle/ — an append-only thought_lifecycle_events receipt log plus a single transactional write path for lifecycle and correction actions (done / defer / needs-review / archive / supersede / correct) on Open Brain thoughts. The mutation and its receipt commit or roll back together, so a thought can't be changed without a matching receipt; a partial UNIQUE index makes "one execution per brief item" a database rule rather than a check-then-write race.

It's purely additive — no changes to the core thoughts table structure and none to the MCP server. The action→status projection lives in the database, so upstream consumers (dashboards, status filters) only ever see legal Open Brain statuses. The pack stands alone: its optional touchpoints with provenance-chains and a brief-store outcome table are exception-guarded, so their absence is a graceful no-op with a warning, not a failure.

Requirements

• A working Open Brain instance (base thoughts table).
• The workflow-status schema applied (thoughts.status / status_updated_at).
• pgvector (ships with core Open Brain) — correct_thought rewrites thoughts.embedding.
• Supabase service_role (RLS and function grants are restricted to it).

No external services, no paid dependencies.

Checklist

• I've read CONTRIBUTING.md
• README has prerequisites, numbered installation steps, expected outcome, and troubleshooting
• metadata.json has all required fields
• Tested on my own Open Brain instance
• No credentials, API keys, or secrets

[github-actions]

Hey @Nev-Harris — welcome to Open Brain Source! 👋

Thanks for submitting your first PR. The automated review will run shortly and check things like metadata, folder structure, and README completeness. If anything needs fixing, the review comment will tell you exactly what.

Once the automated checks pass, a human admin will review for quality and clarity. Expect a response within a few days.

If you have questions, check out CONTRIBUTING.md or open an issue.