PR #3402's real Windows CI (windows-latest node22/24) caught what gsd-test's Linux-only lanes structurally cannot: tests/planning-snapshot-bypass-drift.test.cjs compared the guard's own POSIX-normalized output (findSnapshotBypassDrift's `file` field, dedupeViolationsForBaseline/sortEntries entries, a written baseline read back from disk) against REGISTERED_FILE, which is built via path.join('src', 'verify.cts') and is therefore backslash-separated on Windows. The guard always normalizes its OUTPUT to POSIX via toPosixRel regardless of the input separator form, so the comparison only ever coincidentally passed on POSIX. Adds REGISTERED_FILE_POSIX for every assertion against a guard-PRODUCED value (including baseline fixtures fed into diffAgainstBaseline, which are matched by exact string key against the guard's normalized output). REGISTERED_FILE itself is unchanged and still used, correctly, everywhere it is the relPath INPUT to findSnapshotBypassDrift or a DIAGNOSTIC_RULE_FUNCTIONS Map-key lookup — both need the platform-native form to match the guard's own Map key, which is also path.join-constructed. No behavior change on POSIX (both constants are byte-identical there).
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