HYDI-45: Prevent duplicate scheduler dispatches

[oz-by-warp]

Implements HYDI-45

Changes

• Replaced setInterval scheduler ticking with self-scheduling setTimeout that waits for each cycle to finish before scheduling the next.
• Added atomic queue-claiming via claimRunForSpawn(ticketKey) and safe rollback via releaseSpawnClaim(ticketKey) so only one scheduler cycle can dispatch a queued ticket.
• Guarded upsertDispatchRun conflict updates to block stale queued writes from downgrading running/succeeded rows.
• Added scheduler tests for atomic claim behavior and non-overlapping scheduler cycles.
• Added DB integration coverage for guarded upsert and claim/release semantics.
• Updated architecture, Jira integration, and database docs to reflect the race-condition protections.

Validation

• npm test
• npm run typecheck
• npm run test:coverage

Co-Authored-By: Oz oz-agent@warp.dev

Conversation: https://app.warp.dev/conversation/63c3fd0f-052b-4002-b317-adc91ea63ec2
Run: https://oz.warp.dev/runs/019e88b9-35b2-754d-b5fc-2e265d53ffd0

This PR was generated with Oz.

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Last updated at: 2026-06-02 14:34:59 CET