v2.6.0

v2.6.0 — Detection-flow documentation

Add docs/DETECTION.md: a detailed, code-level walkthrough of the
detection pipeline — page-type fast path (incl. mod / video), price and
free-type logic, the two anti-cheat passes, the auto-collect gate,
deduplication, and the search-page hover flow. Linked from the README;
excluded from the release ZIP as a developer doc. Docs only.

Completes the mod/video (v2.4.0) + search-hover (v2.5.0) + docs batch.