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Lets the HW-H.264 path be live-validated on tagged test agents without affecting the live client fleet. Adds H264_TEST_TAG="h264-test" + a pure prefer_h264_for(tags) helper (DEFAULT_PREFER_H264 || tags contains the tag, case-insensitive); StartStream codec negotiation now computes prefer_h264 from the agent's reported tags instead of the bare const, and logs the computed value. SAFETY: untagged sessions are byte-for- byte unchanged (prefer_h264 == DEFAULT_PREFER_H264 == false -> raw); the supports_h264 guard still forces raw for a no-HW agent even when tagged. DEFAULT_PREFER_H264 stays false (flipping the global default is a separate future step). 3 unit tests added. cargo fmt/clippy(-D warnings)/test green on GURU-5070 (37 agent + 64 server). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>