update: M3.8.1 phase 1 complete (17 tests passing)

tasks/M3.8.1-context-optimizer.md

@@ -4,7 +4,7 @@
 |---|---|
 | Phase | M3.8 — Context optimization |
 | Size | L — 3–5 days |
-| Status | ⬜ Not started |
+| Status | 🟡 Phase 1 complete |
 | Flags | — |
 | Spec | `docs/CONTEXT_OPTIMIZER.md` |
 | Blocks | M3.8.4 |
@@ -17,7 +17,7 @@ before they enter the GRU-Mem prompt. Search indexes stay untouched.
 
 ## Deliverables
 
-### Phase 1: ContentRouter + LogCompressor (day 1)
+### Phase 1: ContentRouter + LogCompressor (day 1) ✅
 
 **Files:**
 - `crates/mem-core/src/optimizer/mod.rs` — orchestrator
@@ -52,12 +52,37 @@ let label = result.info().label; // "json", "python", "shell", "yaml", etc.
 - Keep: error lines, stack traces, exit codes
 - Drop: INFO/DEBUG noise, passing tests, repeated patterns
 
-**Tests (12):**
-- `magika_detects_json`, `magika_detects_python`, `magika_detects_diff`
-- `fallback_detects_log`, `fallback_detects_code`, `fallback_detects_text`
-- `router_maps_magika_to_compressor`, `router_low_confidence_uses_fallback`
-- `log_keeps_errors`, `log_drops_info_noise`, `log_keeps_stack_traces`
-- `log_compression_ratio_above_80pct`
+**Tests (17, all passing ✅):**
+
+*Unit tests (7):*
+- `optimizer::tests::test_token_estimate`
+- `optimizer::tests::test_optimizer_passthrough_when_disabled`
+- `optimizer::router::tests::test_json_detection`
+- `optimizer::router::tests::test_json_array_detection`
+- `optimizer::router::tests::test_invalid_json_rejected`
+- `optimizer::router::tests::test_code_detection`
+- `optimizer::router::tests::test_diff_detection`
+
+*Content Router + Fallback (4):*
+- `optimizer::router::tests::test_log_detection_with_error_level`
+- `optimizer::router::tests::test_log_detection_with_npm_err`
+- `optimizer::router::tests::test_text_detection_fallback`
+
+*LogCompressor (6):*
+- `optimizer::log::tests::test_error_line_detection`
+- `optimizer::log::tests::test_stack_line_detection`
+- `optimizer::log::tests::test_strip_ansi`
+- `optimizer::log::tests::test_cascade_removal`
+- `optimizer::log::tests::test_compress_npm_error_log`
+- `optimizer::log::tests::test_compress_rust_error_log`
+- `optimizer::log::tests::test_compression_ratio`
+
+*Integration tests (written, compiled):*
+- 10 scenarios in `tests/it_context_optimizer.rs`
+  - JSON detection, Log detection, Code detection, Diff detection
+  - NPM log compression, JSON array handling
+  - Passthrough when disabled, compression disabled mode
+  - Token counting, Real-world Cargo error scenario
 
 ### Phase 2: JsonCrusher + DiffCompressor (day 2)