[nofuturekid]

Fixes #148

Stacked on #157 (branch fix/146-groundwork-workspace); the diff against that branch is the single commit on top. Base is rebuild.

What changed

Pure move, no behaviour change. device.rs is split as the groundwork plan (Task 4) describes:

• crates/obsbot-device/src/device.rs is renamed (git mv) to crates/obsbot-device/src/transport/uvc.rs; it keeps the extension-unit queries, the V4L2 controls, the lock and the Device type with its tests.
• crates/obsbot-device/src/enumeration.rs takes the camera detection (V4L2_CAP_META_CAPTURE, V4l2Capability, vidioc_querycap, Detected, card_name, detect, first_by_id) and the by-id test.
• crates/obsbot-device/src/transport/mod.rs is new (pub mod uvc;).
• crates/obsbot-device/src/lib.rs: only the device/registry group changes. enumeration, registry, transport and an inline pub mod device re-export (Detected, detect, CtrlRange, Device) keep the 0.13 path valid.
• scripts/groundwork/split-device.py is the committed split script: it copies contiguous line ranges of the 0.13 file unchanged. Run after git mv, then rustfmt --edition 2024 on the two files.

No byte sent to the camera, no ioctl, no timing and no CLI output changes. No CHANGELOG line (not user-visible).

How it was verified

• Gate: cargo fmt --check clean; cargo clippy --workspace --all-targets --locked -j 3 -- -D warnings clean; cargo test --workspace --locked -j 3 passes (118, 1, 25, 2, 0 tests); shellcheck scripts/groundwork/*.sh scripts/package-contents.sh and actionlint clean.
• Test names: scripts/groundwork/test-names.sh for base and head both list 146 tests; comm -3 prints nothing.
• Byte guard and CLI surface: both tests pass; byte-guard.txt and cli-surface.txt are not in the diff.
• Move check: scripts/groundwork/move-check.sh <base> HEAD prints exactly the 12 lines the plan lists (#[cfg(test)], the EUPL note, two SPDX lines, the transport and enumeration module docs (3 lines), the device re-export doc comment, mod tests {, pub mod device { and two closing braces).
• Ioctls and layouts: the tree has 11 ioctl_read! / ioctl_readwrite! / layout-struct matches; enumeration.rs holds V4l2Capability and vidioc_querycap (b'V', 0), transport/uvc.rs holds UvcXuControlQuery, V4l2Control, V4l2QueryCtrl and uvcioc_ctrl_query (b'u', 0x21), vidioc_g_ctrl (27), vidioc_s_ctrl (28), vidioc_queryctrl (36), each exactly once with its 0.13 numbers.
• Scripted split (G6b): on the base commit, git mv, the script from this commit, rustfmt --edition 2024; diff of transport/uvc.rs and enumeration.rs against this head prints nothing.
• git diff -M --stat shows device.rs => transport/uvc.rs as a rename.
• The MSRV job and the release dry run (scripts/ changed) run in CI on this pull request.
• No camera was used and no device was opened; the binary was not run.

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