feat: plane webhook intake & protosocket consumer wire readiness
- Add Plane webhook handler for issue events (created, state, assignees)
- Add Plane webhook integration tests with testdata fixtures
- Add Gito Protosocket consumer wire readiness milestone
- Add Plane work item webhook intake milestone
- Add agent-task for plane-work-item-webhook-intake (trigger dispatch, idempotency, live smoke)
- Update service config, router, handlers for Plane webhook endpoints
- Add SOPS env setup script and secrets configuration
- Update agent-ops domain rules and phase roadmap
toki
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