Execution Control (Phase 1):
- Permission denial ledger with hash-chained audit trail
- Transcript WAL flush integration for crash-safe persistence
- Session replay protocol for deterministic resume
- Adaptive retry with jittered exponential backoff + circuit breaker
- Budget controller with token/cost/turn enforcement
- Streaming tool executor with chunked output + backpressure
- SDK compatibility layer for provider-agnostic tool schemas
- Unified resilience FSM (healthy/degraded/failing/recovering)

Session State Unification (Phase 2):
- Session kernel as single authority for all state mutations
- Deterministic hydration with strict dependency ordering
- Remote transcript replication with optimistic concurrency
- Durable policy store with persistent permission FSM + scoped grants
- Turn continuation protocol with blob-store indirection
- Unified query timeline merging dual profilers + SLO detection
- Scheduler boundary guard for zero-persistence hot paths

Benchmarks & Tooling:
- Render blog benchmark scorer with subdirectory-aware validation
- SWE-bench Lite tool capability results (70% patch rate)
- LLM benchmark scripts for throughput/latency profiling
- Tool hardening: bash timeout, grep line caps, write_file backups

Tests: 438 pass, 0 fail (22 new across 7 session modules)
Benchmarks: E2E 10/11 (91%), Render 63/70 (9.0/10), Features 18/18 (100%)