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docs: update M3.8 task specs (M3.8.3-6 detailed)

M3.8.3 ✅ COMPLETE (7 tests)
- MetricsCollector: per-project aggregation
- Structured logging (tracing)
- Prometheus export format

M3.8.4 ✅ IMPLICIT (no work needed)
- Query path already clean (no compression)
- Only cache_metrics() uses optimizer (for observability)

M3.8.5 ⏳ ACTIVE (16 tests spec'd)
- Compression ratio benchmarks (5 tests: log/json/text/diff/mixed)
- Search quality validation (8 tests: pgvector/opensearch/fusion)
- Performance baseline (3 tests: latency/throughput/memory)

M3.8.6 ⏳ PENDING (13 gate assertions)
- Safety (6): no data loss, deterministic, structure preservation
- Performance (4): latency p99 <3ms, throughput 1000+/sec, memory <100MB
- Quality (3): compression targets, search improvement, cache accuracy

Project progress: 64/78 complete (82%), 8/13 gates green
Total M3.8 tests: 103 (62+5+7+0+16+13)

2026-08-28 11:46:09 -07:00

2.3 KiB

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M3.8.4 — Query Path Cleanup (IMPLICIT - COMPLETE)

Field	Value
Phase	M3.8 — Context optimization
Size	S — 0 days (no changes needed)
Status	✅ COMPLETE
Depends	M3.8.3
Blocks	M3.8.5

Summary

✅ IMPLICIT COMPLETION

When M3.8 architecture was corrected (ingest vs query), the query path was already clean:

Current State:

❌ NO query-path compression in build_cache_aligned()
✅ Only cache_metrics() calls optimizer (for metrics collection only, not compression)
✅ Actual chunks sent to LLM are unmodified
✅ Optimization happens at ingest time via M3.8.2 helpers

What Didn't Need Changing:

PromptBuilder::build_cache_aligned() — Already doesn't compress chunks
PromptBuilder::cache_metrics() — Only uses optimizer for token estimation (okay for metrics)
PromptBuilder::build() — Legacy path, unmodified

Why This is Better:

Clean separation: ingest optimizes, query doesn't
LLM gets pre-optimized chunks from search results
No per-query optimization overhead
Cache metrics track drift for observability (non-destructive)

Verification

All prompt tests still passing (11 tests):

test prompt::tests::test_cache_aligned_chunk_budget_exceeded ... ok
test prompt::tests::test_cache_aligned_contains_query ... ok
test prompt::tests::test_cache_aligned_memory_budget_exceeded ... ok
test prompt::tests::test_cache_aligned_produces_two_user_messages ... ok
test prompt::tests::test_cache_prefix_is_stable_across_chunks ... ok
test prompt::tests::test_cache_prefix_is_stable_across_memory_changes ... ok
test prompt::tests::test_cache_prefix_tokens_positive ... ok
test prompt::tests::test_headroom_positive_under_budget ... ok
test prompt::tests::test_legacy_build_still_works ... ok
test prompt::tests::test_render_chunk_multiple_roles ... ok
test prompt::tests::test_render_chunk_single_record ... ok

Files Verified

crates/mem-core/src/prompt.rs — No query-path compression
crates/mem-core/src/optimizer/mod.rs — Optimizer available for metrics only
No changes required

Status

✅ Complete

This task represents "no work needed" because the architecture was corrected upfront:

Optimizer at ingest (M3.8.2) ✅
Metrics collection in query (M3.8.3) ✅
No compression in query ✅

The query path is already clean.

2.3 KiB Raw Blame History