Air Pointer support for first-generation Siri Remote

[kefrulz]

Context

RemoMouse 0.1.0 deliberately does not expose Air Pointer mode for the first-generation Siri Remote.

A controlled motion trace found the expected sensor-related HID interfaces but received zero usable motion reports through the available user-space path. Shipping cursor control without measured axes, cadence, neutral behavior, and drift characteristics would be unreliable.

See the first-generation motion report.

Goal

Provide an optional LG Magic Remote-style Air Pointer only when a supportable input path and validated decoder exist.

Acceptance criteria

• Identify a legally reusable, supportable source for at least two motion axes
• Record a sanitized controlled trace for still, yaw, pitch, and roll sequences
• Establish report cadence, neutral region, range, orientation, and discontinuity behavior
• Add deterministic decoder fixtures without committing device identifiers
• Add calibration, dead-zone, drift suppression, smoothing, and bounded acceleration tests
• Cancel motion, drag, and momentum safely on sleep, disconnect, pause, and mode changes
• Hardware-test slow targeting, full-screen travel, click stability, scrolling while aiming, and reconnect recovery
• Keep Air Pointer hidden or unavailable when the capability probe fails

Constraints

Do not use undocumented bytes as guessed cursor input. Any reused open-source implementation must have a compatible license and receive required attribution.