sdlc: accept the schema_version 3 -> 4 migration

`sdlc` 0.5.1 rewrites every feature manifest on read - `sdlc state` alone did
this - so the migration cannot be avoided, only recorded. It is idempotent:
repeated reads produce no further churn (verified by checksum).

What schema 4 drops, so it is findable later:
- feature-level `id` (now derived from `slug`) and `updated_at`.
- per-task history: `created_at` is re-stamped with the migration instant and
  `completed_at` is nulled, so task timing before 2026-08-16 is not recoverable
  from these files.
- m9-community-profile-sync additionally loses 18 phase-history and artifact
  timestamps (`entered`/`exited`/`approved_at`, 2026-03-04).

The pre-migration record is this commit's parent:
  git show HEAD~1:.sdlc/features/m9-community-profile-sync/manifest.yaml

Committed separately from any state transition so the loss is one reviewable
diff rather than noise inside a feature change. `.sdlc/` is CLI-owned; nothing
here was hand-edited.

.sdlc/features/m10-agent-capability-boundaries/manifest.yaml

@@ -161,4 +161,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m10-community-policy-engine/manifest.yaml

@@ -152,4 +152,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m10-signal-revocation-controls/manifest.yaml

@@ -98,4 +98,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m9-community-profile-sync/manifest.yaml

@@ -1,64 +1,63 @@
-id: m9-community-profile-sync
 slug: m9-community-profile-sync
 title: Community Profile Sync
 description: Opt-in sharing from local embedded profiles to community personalization layers — events flow to shared aggregates while local WAL remains primary
 phase: released
 created_at: 2026-03-03T06:29:37.975394Z
-updated_at: 2026-03-04T17:17:00.000000Z
+updated_at: 2026-03-04T17:17:00Z
 artifacts:
 - artifact_type: spec
   status: approved
   path: .sdlc/features/m9-community-profile-sync/spec.md
-  created_at: 2026-03-04T01:51:00.000000Z
+  created_at: 2026-03-04T01:51:00Z
-  approved_at: 2026-03-04T01:51:00.000000Z
+  approved_at: 2026-03-04T01:51:00Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: design
   status: approved
   path: .sdlc/features/m9-community-profile-sync/design.md
-  created_at: 2026-03-04T01:51:05.000000Z
+  created_at: 2026-03-04T01:51:05Z
-  approved_at: 2026-03-04T01:51:05.000000Z
+  approved_at: 2026-03-04T01:51:05Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: tasks
   status: approved
   path: .sdlc/features/m9-community-profile-sync/tasks.md
-  created_at: 2026-03-04T01:51:08.000000Z
+  created_at: 2026-03-04T01:51:08Z
-  approved_at: 2026-03-04T01:51:08.000000Z
+  approved_at: 2026-03-04T01:51:08Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: qa_plan
   status: approved
   path: .sdlc/features/m9-community-profile-sync/qa-plan.md
-  created_at: 2026-03-04T01:51:10.000000Z
+  created_at: 2026-03-04T01:51:10Z
-  approved_at: 2026-03-04T01:51:10.000000Z
+  approved_at: 2026-03-04T01:51:10Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: review
   status: approved
   path: .sdlc/features/m9-community-profile-sync/review.md
-  created_at: 2026-03-04T01:51:50.000000Z
+  created_at: 2026-03-04T01:51:50Z
-  approved_at: 2026-03-04T01:51:50.000000Z
+  approved_at: 2026-03-04T01:51:50Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: audit
   status: approved
   path: .sdlc/features/m9-community-profile-sync/audit.md
-  created_at: 2026-03-04T01:52:02.000000Z
+  created_at: 2026-03-04T01:52:02Z
-  approved_at: 2026-03-04T01:52:02.000000Z
+  approved_at: 2026-03-04T01:52:02Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
 - artifact_type: qa_results
   status: approved
   path: .sdlc/features/m9-community-profile-sync/qa-results.md
-  created_at: 2026-03-04T01:55:40.000000Z
+  created_at: 2026-03-04T01:55:40Z
-  approved_at: 2026-03-04T01:55:40.000000Z
+  approved_at: 2026-03-04T01:55:40Z
   rejected_at: null
   rejection_reason: null
   approved_by: null
@@ -69,34 +68,34 @@ blockers: []
 phase_history:
 - phase: draft
   entered: 2026-03-03T06:29:37.975394Z
-  exited: 2026-03-04T01:51:00.000000Z
+  exited: 2026-03-04T01:51:00Z
 - phase: specified
-  entered: 2026-03-04T01:51:00.000000Z
+  entered: 2026-03-04T01:51:00Z
-  exited: 2026-03-04T01:51:08.000000Z
+  exited: 2026-03-04T01:51:08Z
 - phase: planned
-  entered: 2026-03-04T01:51:08.000000Z
+  entered: 2026-03-04T01:51:08Z
   exited: 2026-03-04T01:51:08.235537Z
 - phase: ready
   entered: 2026-03-04T01:51:08.235537Z
   exited: 2026-03-04T01:51:13.153999Z
 - phase: implementation
   entered: 2026-03-04T01:51:13.153999Z
-  exited: 2026-03-04T01:51:50.000000Z
+  exited: 2026-03-04T01:51:50Z
 - phase: review
-  entered: 2026-03-04T01:51:50.000000Z
+  entered: 2026-03-04T01:51:50Z
   exited: 2026-03-04T01:52:02.724965Z
 - phase: audit
   entered: 2026-03-04T01:52:02.724965Z
-  exited: 2026-03-04T01:55:40.000000Z
+  exited: 2026-03-04T01:55:40Z
 - phase: qa
-  entered: 2026-03-04T01:55:40.000000Z
+  entered: 2026-03-04T01:55:40Z
-  exited: 2026-03-04T01:55:48.000000Z
+  exited: 2026-03-04T01:55:48Z
 - phase: merge
-  entered: 2026-03-04T01:55:48.000000Z
+  entered: 2026-03-04T01:55:48Z
   exited: 2026-03-04T01:55:48.195642Z
 - phase: released
   entered: 2026-03-04T01:55:48.195642Z
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m9-leave-revocation/manifest.yaml

@@ -1,4 +1,3 @@
-id: m9-leave-revocation
 slug: m9-leave-revocation
 title: Leave & Stop-Forward
 description: 'User leaves community layer: stop forwarding new signals, snapshot current contribution boundary, allow opt-back-in path'
@@ -99,4 +98,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m9-purge-rematerialization/manifest.yaml

@@ -1,4 +1,3 @@
-id: m9-purge-rematerialization
 slug: m9-purge-rematerialization
 title: Re-materialization after Purge
 description: 'Background re-materialization engine: replay community WAL minus purged contributions, verify aggregate convergence, emit audit log'
@@ -99,4 +98,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/m9-retroactive-purge/manifest.yaml

@@ -1,4 +1,3 @@
-id: m9-retroactive-purge
 slug: m9-retroactive-purge
 title: Retroactive Signal Purge
 description: 'On explicit purge request: remove user''s contributed signals from community aggregates with deterministic re-materialization, preserving correctness'
@@ -65,28 +64,76 @@ artifacts:
 tasks:
 - id: T1
   title: 'T1: CohortContributionLog'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081106Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T2
   title: 'T2: Ledger Retraction Methods'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081108Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T3
   title: 'T3: Tag::PurgeManifest Storage Key'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081109Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T4
   title: 'T4: PurgeCoordinator and PurgeManifest'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081110Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T5
   title: 'T5: TidalDb Struct Fields'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081111Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T6
   title: 'T6: Wire Contribution Log into Signal Hot Path'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081116Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T7
   title: 'T7: Public API db/purge.rs'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081117Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 - id: T8
   title: 'T8: Integration Tests'
-  status: done
+  description: null
+  status: completed
+  created_at: 2026-08-16T15:43:26.081118Z
+  started_at: null
+  completed_at: null
+  blocker: null
+  depends_on: []
 comments: []
 next_comment_seq: 0
 blockers: []
@@ -99,4 +146,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p1-briefing-ux-reason-labels/manifest.yaml

@@ -1,4 +1,3 @@
-id: p1-briefing-ux-reason-labels
 slug: p1-briefing-ux-reason-labels
 title: Briefing UX & Reason Labels
 description: Card UI spec with reasons taxonomy and source exposure rules — users see why each item was surfaced
@@ -162,4 +161,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p1-feedback-loop-ux/manifest.yaml

@@ -1,4 +1,3 @@
-id: p1-feedback-loop-ux
 slug: p1-feedback-loop-ux
 title: Feedback Loop UX
 description: Mute/hide/like controls with immediate next-refresh reflection; negative feedback visible in ranking within one refresh cycle
@@ -113,4 +112,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p1-quality-diversity-baseline/manifest.yaml

@@ -1,4 +1,3 @@
-id: p1-quality-diversity-baseline
 slug: p1-quality-diversity-baseline
 title: Quality & Diversity Baseline
 description: Quality gates (min completion rate, score threshold) and diversity constraints active in top results; no creator dominates the brief
@@ -126,4 +125,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p2-cohort-context-views/manifest.yaml

@@ -1,4 +1,3 @@
-id: p2-cohort-context-views
 slug: p2-cohort-context-views
 title: Cohort & Context Views
 description: Cohort-trending surface ('what's trending for people like you') and session context mode visible in the product
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p2-self-serve-onboarding/manifest.yaml

@@ -1,4 +1,3 @@
-id: p2-self-serve-onboarding
 slug: p2-self-serve-onboarding
 title: Self-Serve Onboarding
 description: Onboarding flow with defaults and profile bootstrap; new user goes from signup to first ranked brief in under 3 minutes
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p2-trust-controls/manifest.yaml

@@ -1,4 +1,3 @@
-id: p2-trust-controls
 slug: p2-trust-controls
 title: Trust Controls & Transparency
 description: Mute/hide persistence across sessions, quality signals visible to user, explanation UX for why items were surfaced
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p3-launch-support-playbook/manifest.yaml

@@ -1,4 +1,3 @@
-id: p3-launch-support-playbook
 slug: p3-launch-support-playbook
 title: Launch & Support Playbook
 description: Launch checklist, incident roles, communication templates — team can respond to production issues within defined SLA
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p3-quality-operations/manifest.yaml

@@ -1,4 +1,3 @@
-id: p3-quality-operations
 slug: p3-quality-operations
 title: Quality Operations
 description: Quality floor checks, regression dashboards, and alerting — no launch-day quality regressions ship undetected
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p3-reliability-slos/manifest.yaml

@@ -1,4 +1,3 @@
-id: p3-reliability-slos
 slug: p3-reliability-slos
 title: Reliability & SLOs
 description: Launch SLOs defined, monitoring active, error budgets tracked — briefing generation latency and availability within targets
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p4-monetization-experiments/manifest.yaml

@@ -1,4 +1,3 @@
-id: p4-monetization-experiments
 slug: p4-monetization-experiments
 title: Monetization Experiments
 description: Pricing tests, conversion funnel instrumentation — measure which monetization model converts without degrading quality metrics
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p4-quality-safe-growth/manifest.yaml

@@ -1,4 +1,3 @@
-id: p4-quality-safe-growth
 slug: p4-quality-safe-growth
 title: Quality-Safe Growth
 description: Guardrails that prevent revenue-over-quality regressions as user volume scales — D7 retention and useful-item rate monitored against growth rate
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/p4-segment-expansion-plan/manifest.yaml

@@ -1,4 +1,3 @@
-id: p4-segment-expansion-plan
 slug: p4-segment-expansion-plan
 title: Segment Expansion Plan
 description: Data-backed expansion strategy and milestone proposal for next target segment or market
@@ -72,4 +71,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/pg1-baseline-comparison/manifest.yaml

@@ -1,4 +1,3 @@
-id: pg1-baseline-comparison
 slug: pg1-baseline-comparison
 title: Baseline Comparison Study
 description: A/B comparison against a non-personalized baseline feed — measure click-through, completion, and return rate lift
@@ -153,4 +152,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/pg1-instrumented-metrics/manifest.yaml

@@ -1,4 +1,3 @@
-id: pg1-instrumented-metrics
 slug: pg1-instrumented-metrics
 title: Instrumented Metrics Pipeline
 description: Signal write rates, ranking latency p50/p99, personalization staleness, and feedback-loop latency all observable in production
@@ -162,4 +161,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4

.sdlc/features/pg1-personalization-correctness/manifest.yaml

@@ -1,4 +1,3 @@
-id: pg1-personalization-correctness
 slug: pg1-personalization-correctness
 title: Personalization Correctness Verification
 description: Verify the personalization loop (signal write → decay → ranking) is mathematically correct and updates within 100ms of signal write
@@ -144,4 +143,4 @@ phase_history:
   exited: null
 dependencies: []
 archived: false
-schema_version: 3
+schema_version: 4