M3.8.4 — M3.8 Composition Gate

Field	Value
Phase	M3.8 — Context optimization
Size	M — 1 day
Status	⬜ Not started
Depends	M3.8.3 (benchmarks)
Blocks	M3.9

Goal

Verify M3.8 implementation meets safety and performance constraints across realistic failure scenarios.

Gate Assertions

Safety (6 assertions)

No data loss — CCR store retrieves 100% of compressed content
Cache correctness — Drift metric accurate (< 5% error vs. actual)
Compression lossless — Decompressed == original (where applicable)
Format stability — JSON/diff/log structures preserved
Error graceful — Optimizer failure doesn't crash pipeline
Thread-safe — Concurrent optimizations don't corrupt state

Performance (4 assertions)

Latency — Per-chunk optimization < 3ms (p99)
Cache hit rate — Stable prefix unchanged >= 70% across queries
Throughput — 1000 chunks/sec sustained
Memory — Cache size stays < 100MB (max 1000 entries @ 100KB each)

Quality (3 assertions)

Compression met — All 4 content types meet targets
No false positives — Cache eligible when drift < 0.3
Coverage — Benchmarks > 95% compression code paths

Test Implementation

File: tests/it_m3_8_gate.rs (200 LOC)

#[test]
fn m3_8_gate_no_data_loss() { ... }

#[test]
fn m3_8_gate_cache_correctness() { ... }

#[test]
fn m3_8_gate_compression_targets() { ... }

#[test]
fn m3_8_gate_latency_p99() { ... }

#[test]
fn m3_8_gate_concurrent_safety() { ... }

#[test]
fn m3_8_gate_cache_hit_rate() { ... }

Tests: 6 (safety) + 4 (performance) + 3 (quality) = 13 total

Acceptance

✅ All 13 gate assertions passing ✅ 117+ optimizer unit tests passing ✅ Benchmarks meeting compression targets ✅ No regressions in other modules (prompt, query, etc.) ✅ Documentation complete (CONTEXT_OPTIMIZER.md, headers in code)

Success Criteria

M3.8.4 gate 100% pass rate
Zero blocking issues from integration tests
Ready for M3.8 → production hand-off

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