Phase 7 — Work-capture + autonomous backlog (real-time MCP capture, idle-agent dispatch, burndown/token metrics, PR-gate-to-close)

**Decomposed into 6 subtasks** (JC directive: phase items carry their work units as subtasks) - P7.1 MCP-native capture -> P7.2 idle dispatch -> P7.3 PR-gate are the autonomy core, in that order - P7.4 metric views + P7.5 rollups are read-side, parallelizable - P7.6 absorbs BUILD-21 Phase C - Done-state on subtasks blocked on BUILD-24 (no done-toggle API yet) — status rides in titles till then

Re-sequenced: now QUEUE #2 behind BUILD-21 webhooks (whose Phase C subscriber registry lands inside this phase anyway).

QUEUE #1 (next after in-flight BUILD-7 P6 + BUILD-20 pipeline land). Phase 7 remainder: real-time capture depth + idle-agent backlog dispatch + Slack rollups; capture-core (metrics/burndown/self-report) already live via BUILD-11.