Replace pg-boss with owned PostgreSQL queue store

[evantahler]

Summary

• rename the package and project from pgboss-queue to pg-queue
• remove pg-boss and replace its job/queue schema with owned pgrq_jobs and pgrq_queues tables
• add bundled, versioned SQL migrations applied transactionally under an advisory lock
• add atomic FOR UPDATE SKIP LOCKED job claiming and strengthen connection/migration tests
• use PostgreSQL-safe pgqueue as the default schema and reject the reserved pg_ prefix
• update the living phase plans and lessons learned

Verification

• bun run lint
• bun run build
• bun test --max-concurrency=1 (78 pass, 7 documented Redis-only skips)
• node scripts/assert-node-package.mjs
• bun pm pack --dry-run (includes migrations/001_initial.sql)

Implements the revised storage design in docs/plans/02-connection-and-schema.md and docs/plans/03-queue.md.

  

[cursor]

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