docs: mark M0-M8 complete in roadmap with milestone-level summaries

- Add milestone-level COMPLETE summary bullets for M0–M8 (only M8 had one)
- Fix m8p6 lib test count (1199 → 1206 after latest additions)
- Update iknowyou/Aeries date to 2026-02-24
- Each summary captures the key capabilities proved by that milestone

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/planning/ROADMAP.md

@@ -106,6 +106,8 @@ The roadmap now has two tracks:
 | **iknowyou M1: Chat Interface (Aeries)** | COMPLETE | Next.js 15 + React 19 + Tailwind v4 (OKLCH dark); SSE streaming from Qwen3-8B via vLLM; Zustand state; port 59521 |
 | **iknowyou M2: Memory Layer (Synap)** | COMPLETE | Conversations persist; observer extracts learnings; top-5 vivid memories injected into system prompt; conversation sidebar with localStorage + Synap |
 | **iknowyou M3: Deep Observer** | COMPLETE | Two-tier observer: Tier 1 extracts full ObserverOutput (engagement, style, topic, dynamics) on every exchange; Tier 2 synthesizes natural-language observations every 5 turns; dimension-tagged signal storage in Synap |
+| **iknowyou M4: Cohort Engine** | COMPLETE | Person identity, soft cohort assignment, cohort priors, and profile persistence wired into chat loop |
+| **iknowyou M5: Communication Brief** | IN PROGRESS | Brief assembly + `/api/brief/[personId]` + prompt injection are live; milestone acceptance validation pending |
 | **m7p1: Crash Recovery Hardening** | COMPLETE | 900 lib + 8 m7_crash_property + 10 m7_crash_m6 + 5 m7_crash_invariant (100 cases); recovery bench passing; WAL compaction, BLAKE3 checkpoint integrity, hard-negative crash invariant |
 | **m7p2: Graceful Degradation, Rate Limiting, and Session Cleanup** | COMPLETE | 896 lib + 12 m7p2_load; 1,191 total (--features test-utils); 4-stage degradation, per-agent token-bucket rate limiter, session TTL sweeper |
 | **m7p3: Performance at Scale** | COMPLETE | 900 lib + all integration; 1,201 total; scale bench (1M items), USearch ef=400, LogMergePolicy, signal trimmer (5M entry cap), social scale tests |
@@ -116,16 +118,32 @@ The roadmap now has two tracks:
 | **m8p3: CRDT Counters and Deterministic Reconciliation** | COMPLETE | 1125 lib + 13 m8p3_crdt property tests; HLC/HlcTimestamp, PNCounter, LWWRegister, CrdtSignalState, ReconciliationEngine, StateSnapshot |
 | **m8p4: Session Continuity Across Regions** | COMPLETE | 1163 lib + 8 m8p4_session integration tests; SessionSeqNo+HWM, IdempotencyKey/Store (lru 0.12), SessionReplicationBridge (sync crossbeam), HardNeg union semantics with HLC gating |
 | **m8p5: Control Plane + Multi-Tenancy + Routing** | COMPLETE | 1194 lib + 5 m8p5_multitenancy integration tests; TenantId/TenantConfig, TenantRateLimiter (AtomicU64 CAS token-bucket), TenantRouter (Jump Consistent Hash), ControlPlane (shard heartbeat + health), TenantMigration state machine, RollingUpgradeCoordinator |
-| **m8p6: End-to-End UAT** | COMPLETE | 1199 lib + 8 m8_uat tests (0.11s); SimulatedCluster (signal-replay harness, 3 regions), NetworkPartition/ShardCrash RAII fault injection, 5 UAT steps + 3 perf assertions; p99 replication < 2s, failover < 10s, CRDT reconciliation < 100ms |
+| **m8p6: End-to-End UAT** | COMPLETE | 1,206 lib + 8 m8_uat tests (0.11s); SimulatedCluster (signal-replay harness, 3 regions), NetworkPartition/ShardCrash RAII fault injection, 5 UAT steps + 3 perf assertions; p99 replication < 2s, failover < 10s, CRDT reconciliation < 100ms |
 
-**M8 Distributed Fabric: COMPLETE** — All 6 phases done.
+**M0 Embeddable Runtime: COMPLETE** — m0p1 (skeleton), m0p2 (tooling/diagnostics), m0p3 (samples/docs). Zero-config in-process runtime with WAL, fjall backend, and tidalctl CLI operational.
+
+**M1 Signal Engine: COMPLETE** — m1p1–m1p5 all done. Signals are a database primitive with O(1) decay, windowed aggregation, and velocity — not application math. WAL + fjall durability included.
+
+**M2 Ranked Retrieval: COMPLETE** — m2p1–m2p5 all done. RETRIEVE query combines vector index (USearch), metadata filters, ranking profiles, and diversity in one operation.
+
+**M3 Personalized Ranking: COMPLETE** — m3p1–m3p4 all done. User/creator entities, feedback loop, personalized profiles, hard negatives, and "For You" query working end-to-end.
+
+**M4 Agent Memory: COMPLETE** — Sessions, session policy, RLHF export, cross-session aggregation, and crash recovery for agent-mediated personalization all operational.
+
+**M5 Hybrid Search: COMPLETE** — m5p1–m5p4 all done. BM25 + ANN + RRF fusion, creator search, similar-to, search_click feedback. Hybrid search < 50ms; creator search < 20ms. Re-verified 2026-02-24: 1,206 lib + 27 M5 integration tests passing.
+
+**M6 Full Surface Coverage: COMPLETE** — m6p1–m6p6 all done. All 14 use cases, every sort mode, cohort trending, social graph scoping, collections, live content, notification capping, adaptive preferences, SUGGEST autocomplete. Re-verified 2026-02-24: 1,206 lib + 70 M6 integration tests passing.
+
+**M7 Production Hardening: COMPLETE** — m7p1–m7p4 + Enterprise Readiness all done. Crash recovery (BLAKE3 integrity, WAL compaction), 4-stage graceful degradation, per-agent rate limiting, session TTL sweeper, scale to 1M items, Prometheus metrics, tidalctl diagnostics, RLHF export.
+
+**M8 Distributed Fabric: COMPLETE** — m8p1–m8p6 all done. Shard-aware keyspaces, WAL shipping + follower replay, CRDT counters + deterministic reconciliation, session continuity across regions, control plane + multi-tenancy + jump-consistent routing, rolling upgrade coordinator. 1,206 lib + all phase integration tests passing.
 
 **Forage: COMPLETE** — All 5 phases done (P0: demo loop, P1: real signal surface, P2: semantic embeddings, P3: adaptive MAB, P4: bridge/surprise moment). Chrome extension + forage-server + forage-engine + forage-embedder sidecar all operational.
 
-**iknowyou / Aeries: IN PROGRESS** — M1–M3 complete (streaming chat, memory layer, deep observer). Next: M4 (Cohort Engine).
+**iknowyou / Aeries: IN PROGRESS (as of 2026-02-24)** — M1–M4 complete. M5 (Communication Brief) is in progress with core implementation live; acceptance validation pending.
 
 **Next (engine):** M9 Phase 1 — Signal Scope and Share Contract.
-**Next (product):** iknowyou M4 — Cohort Engine (behavioral clustering, cold-start priors).
+**Next (product):** iknowyou M5 acceptance pass, then M6 Closed Loop (session lifecycle + preference drift validation).
 
 ---