Mission Control final sweep (single PR)

This PR closes the remaining Mission Control checklist deltas by aligning docs/checklist with implemented backend reality and finishing remaining polish called out for overnight scope.

✅ Completed in this sweep

• Memory sync polish
  • Added Mission Control memory edit endpoint path (PATCH /api/v1/memory/:id)
  • Added Mission Control memory delete endpoint path (DELETE /api/v1/memory/:id)
  • Added memory list date-range filtering (startDate, endDate) + listing without agentSlug
  • Added explicit memory sync-status handling on edits (pending to signal outbound sync)
• Launch-gate/checklist alignment
  • Updated PRD Phase 2 execution checklist checkboxes to reflect shipped state and current script surfaces
• Run-health / readiness operator path polish
  • Replaced placeholder mission-control-readiness-drill script with env-aware dry-run/live drill logic
  • Added concrete checks for dashboard/retention and optional live pause/escalate control drills
• Docs consistency
  • Expanded mission-runs API docs with run controls, retention, dashboard, and scope notes

API routes updated

• Added PATCH + DELETE route wiring for /api/v1/memory/:id in convex/http.ts
• Enhanced memoryHandler in convex/missionControlApi.ts for:
  • generic memory listing when agentSlug is absent
  • date-range + sync-status filters
  • patch/delete support by memory id

Verification

• npm run mission-control:validate-observability ✅ pass
• npm run mission-control:readiness-drill ✅ pass (dry-run env-less mode)
• npm run test:e2e -- e2e/mission-control-phase1.spec.ts ✅ 1 passed / 6 skipped
• npm run lint ⚠️ fails due to broad pre-existing repository lint debt (not introduced in this PR)
• npm run build ⚠️ fails due to pre-existing Convex generated-api typing/module issues in DID resource/log modules

Blockers / remaining caveats

• End-to-end live readiness control drill (pause/kill/escalate against real run ids) requires deployed env and valid MISSION_CONTROL_BASE_URL + MISSION_CONTROL_API_KEY.
• Existing repo-wide lint/build failures are unrelated baseline debt and remain outside this focused mission-control sweep.