Closes the last pure-logic coverage gaps: reduceToCanonical (rate flattening,
tour mapping, social/verifiedProfile filtering, field defaults) and platforms
(normalizePlatformName, getPlatform by id/label, registry invariants). Every
pure module in ad-watch is now unit-tested; 72 tests across 9 suites. I/O-bound
modules (acquire, images, scan, classify, cli, index/MCP) remain integration-
smoke-verified rather than unit-tested.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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