Add live Android sensors command

[isomorphisms]

Promote the live Android sensor enumeration probe into the Grease command tree as commands/sensors.

The command uses the public native Android sensor boundary through the phone's real libandroid.so. The phone does not build it: the ARMv7 Thumb-2 PIE is cross-built off-device, then fetched, verified, installed under $PREFIX/bin/sensors, and executed.

Physical-device result is now present: the exact verified artifact ran successfully on the ARMv7 Android phone and returned the real sensor list (count 0x00000026 in the observed run). Device-specific count, names, vendors, and delays are evidence, not fixed test expectations.

Artifact SHA-256: 9270b8ebd1243b388a17f24a5cad4883363ca7a5dd122431df2d2a7dc49c87f5.

This still does not claim a Grease-language execution receipt: the current command implementation is a freestanding native adapter. The next hardware programs are one fresh accelerometer sample and a continuous accelerometer stream, followed by the semantic /hardware/sensors presentation and alternate adapters such as Linux IIO, Termux:API, 9P, or FUSE.

The matching ARM/Thumb backend sample line is tracked separately so a working C/native oracle is not mislabeled as Idriç-generated backend evidence.

[isomorphisms]

Historical acceptance note corrected.

The environment-specific hold recorded here was based on the withdrawn CI-hosting requirement and is not an acceptance condition. Ordinary maintained Linux CI may use GitHub-hosted ubuntu-latest; no special host registration or label set is required by this PR.

The physical-phone receipt remains scoped to the exact native ARMv7 adapter artifact (SHA-256 9270b8ebd1243b388a17f24a5cad4883363ca7a5dd122431df2d2a7dc49c87f5). It is still not, by itself, a Grease-language execution receipt.