feat(scheduler,packsregistry,registry): postgres backend cutover
Sprint SPRINT_20260415_003_DOCS_scheduler_registry_real_backend_cutover.
- Scheduler WebService: Postgres-backed audit service + resolver job service,
system schedule bootstrap, durable host tests, jwt app factory
- PacksRegistry: persistence extensions + migration 002 runtime pack repo,
durable runtime + startup contract tests
- Registry.TokenService: Postgres plan rule store + admin endpoints,
migration 001 initial schema, durable runtime + persistence tests
- Scheduler.Plugin.Doctor: wiring for doctor job plugin
- Sprint _019 (webhook rate limiter) and _002 (compose storage compat)
land separately.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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