Agent notes — cts/hand/

CRITICAL: complete the mandatory AGENTS.md preflight in ../../../../../AGENTS.md before editing here, and read ../common/AGENTS.md and checker/AGENTS.md.

• Gloves are the target. Headset optical hands cannot show 21-joint layouts, glove axis conversions or wrist-fusion faults.
• Check groups are named, not numbered: signal, shape, placement, windows.
• Dependency direction: capture imports the checker; the checker never imports isaaccapture or capture; the oracle imports neither the checker nor cts_common.
• Physical contact is the ground truth. With no motion capture, the table, pressed palms and touching fingertips are what the data can be held to; new cross-hand steps should be built on contact the performer can feel, not on a pose they approximate.
• Thresholds come from real glove recordings only, never from optical hands or the oracle. Existing ones are loose; do not tighten one to make a fixture pass.
• Capture pacing is a timer; nothing is pressed. A trigger moves a finger and the controller may be the wrist source. Windows are stamped with time.monotonic_ns(), which is the clock sample_time_local_common_clock is in, so labels need no record counting.
• Name the sides in full (left, right, l_h): ruff E741 rejects a bare l, and paired left/right code reaches for it.
• Cue WAVs are committed and hash-checked against session.py through cues/index.json; re-render with piper when wording changes.