perf(source-clean): execute full-tree fingerprint checks in compiled matcher - #397
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The full-tree source-clean step still took roughly 14 minutes on Windows CI even after fingerprint caching, because every substring executes PowerShell function/pipeline operations.
Move only the identifier matching loop into a small in-memory compiled .NET helper within the existing PowerShell script; preserve one-way SHA-256 hashes, candidate lengths (7/8/12/22), embedded token matching, adjacent 1–4-token joining, tracked-path/content scanning, and fail-closed behavior. No allowlist or whole-file exemptions. Add negative cases for multi-token and mixed-case identifiers to the existing end-to-end fixture suite.
No application C#, engine, SCL, Discovery, reporting, release, or baseline evidence changes. Acceptance is source-clean fixture PASS, full Windows test/package PASS and verified source-clean step duration from CI logs.