fix(ingestion): R24e — drop ingestion_job_stages.job_id FK (resolve drift #8)

[BigSimmo]

Resolves drift-reconciliation backlog item #8 in the direction the live evidence supports — the opposite of the earlier "add the FK to live" plan. Follow-up to the RPC hardening merged in #380; both are phase-3 concurrency work off docs/ingestion-state-machine.md (R24e).

Evidence (read-only live catalog, project sjrfecxgysukkwxsowpy):

• Live never had this FK — it exists only in schema.sql + the migration chain, so fresh/preview databases diverge from live.
• The edge agent's stageStart writes an indexing_v3_agent_jobs id into job_id (never an ingestion_jobs id), so on any DB where the FK exists the agent's artifact-repair path dies at its first stage insert (FK 23503).
• Live carries 253 orphan stage rows whose job_id has no ingestion_jobs match — NOT VALID + VALIDATE would fail against them.

Change:

• schema.sql: ingestion_job_stages.job_id is a plain not null column (documented as an intentional non-FK correlation id).
• Migration 20260708140000: drop constraint if exists — no-op on live, removes it on the branch/preview migration chain.
• drift-allowlist.json: remove the now-obsolete FK entry (schema.sql matches live).
• database-drift-detection.md: backlog item Bump gitleaks/gitleaks-action from 2 to 3 #8 marked resolved.
• supabase-schema.test.ts: assert the FK is absent; drift manifest regenerated.

Verified: vitest drift-detection + supabase-schema (52) + ingestion ✅, eslint ✅, drift manifest regenerated ✅. Migration apply to live is an operator step (linked supabase CLI workflow).

Refs #380#377#342
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[supabase]

Updates to Preview Branch (claude/ingestion-r24e-stage-fk) ↗︎

Deployments	Status	Updated
Database	✅	Wed, 08 Jul 2026 07:25:30 UTC
Services	✅	Wed, 08 Jul 2026 07:25:30 UTC
APIs	✅	Wed, 08 Jul 2026 07:25:30 UTC

Tasks are run on every commit but only new migration files are pushed.
Close and reopen this PR if you want to apply changes from existing seed or migration files.

Tasks	Status	Updated
Configurations	✅	Wed, 08 Jul 2026 07:25:38 UTC
Migrations	✅	Wed, 08 Jul 2026 07:26:28 UTC
Seeding	✅	Wed, 08 Jul 2026 07:26:32 UTC
Edge Functions	✅	Wed, 08 Jul 2026 07:26:33 UTC

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[BigSimmo]

Superseded by #389 — same R24e fix (drop the phantom ingestion_job_stages.job_id FK), rebased on latest main (this branch was 8 commits behind and used a different migration filename at the same 20260708140000 timestamp, which would collide). Closing as a duplicate; no content is lost. See #389 for the canonical version.

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[BigSimmo]

Closed after #389 merged the overlapping R24e FK drop. The Codex retry-target fix that landed on this branch was re-opened as #395.