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625290cfbc
Faithful port of `headroom/transforms/content_detector.py` into `headroom-core`. Same regex patterns, dispatch order, confidence formulas, and line-count caps; lockstep with Python via 21 recorded parity fixtures (every dispatch branch exercised). - crates/headroom-core/src/transforms/content_detector.rs: regex-only detector (no ML); ContentType/DetectionResult mirror Python's enum + dataclass surface; metadata uses serde_json::Map for clean PyO3 bridging. - Tie-break in code detection: track scores in first-match insertion order (matches Python dict iteration semantics on `max()` ties). - TypeScript second pattern is start-anchored — Python's `pattern.match(line)` is start-anchored, but the regex crate's `is_match` is unanchored, so the literal `:` prefix is required for parity. - crates/headroom-parity: ContentDetectorComparator + universal f64 normalization in `compare_fixture` (serde_json's lossy parse vs full-precision serialize creates a 1-ULP asymmetry that broke comparison; round-trip the actual through to_string/from_str). - crates/headroom-py: detect_content_type/is_json_array_of_dicts and PyDetectionResult exposed via PyO3 with GIL released during scan. - tests/parity/recorder.py: new `_wrap_function` for free-function recording; content_detector hook + 21 varied inputs covering JSON arrays, diffs, HTML, search, build/log, six languages, and fallbacks. Sets up PR2 (ContentRouter scaffold) to call into Rust ContentDetector in-process via the bridge. |
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