[nofuturekid]

Fixes #146

Stacked on #156 (the guards): this branch starts from fix/145-groundwork-guards, so the diff against rebuild shows #156's commits too until #156 has landed. Only the last commit, Make the source a cargo workspace, belongs to this pull request. Task 2 of the groundwork plan.

What changed

• src/ becomes two crates. crates/obsbot-device (package obsbot-device, library obsbot_device) holds camera, commands, device, error, frame, presets, state, status, streaming and registry (was models.rs). crates/obsbot4linux holds main, cli, client, daemon and proto. Files move with git mv; the two guard tests and their fixtures move into the crates' tests/.
• The root Cargo.toml is a virtual manifest: [workspace.package] (version 0.13.2, edition, rust-version, licence, authors, repository, homepage), [workspace.dependencies], [profile.release] strip = true.
• crates/obsbot4linux/Cargo.toml keeps the package name, the binary name and the deb / rpm metadata, with ../../ asset paths.
• lib.rs is laid out in four blank-line separated groups, one for each following task.
• use paths: obsbot4linux:: becomes obsbot_device::, models becomes registry. Nothing else in the Rust code changes.
• ci.yml and release.yml use --workspace; cargo deb -p obsbot4linux; cargo generate-rpm -p crates/obsbot4linux; crates/*/Cargo.toml is added to the release dry-run paths filter.
• README (registry path), CONTRIBUTING (--workspace), one CHANGELOG line under Changed.
• The program, its output and the packages do not change. No byte sent to the camera, no ioctl and no timing is touched.

Verification (local)

• cargo fmt --check, cargo clippy --workspace --all-targets --locked -- -D warnings, shellcheck scripts/groundwork/*.sh scripts/package-contents.sh, actionlint .github/workflows/*.yml: no output.
• cargo test --workspace --locked: 118 passed (library), 1 passed (byte_guard), 25 passed (binary), 2 passed (cli_surface), 0 doc tests. Same 146 tests as before.
• G1: scripts/groundwork/test-names.sh for the base (12d9e0d) and the head gives 146 names each; comm -3 prints nothing.
• G2 / G3: both fixtures are renames with 0 changed lines (git diff -M --stat).
• G6: scripts/groundwork/move-check.sh <base> HEAD prints exactly the four changed code lines the plan lists (8 lines with the < / > pairs): models::from_card / from_by_id to registry::, obsbot4linux::device::detect and obsbot4linux::state::path to obsbot_device::.
• G7: git diff -M --stat shows every moved file as a rename; device.rs 6 lines, lib.rs 13, byte_guard.rs 6, cli.rs 14, client.rs 4, daemon.rs 8 (use lines and the paths above).
• Cargo.lock diff: adds the obsbot-device entry, changes the dependency list of obsbot4linux to clap, nix, obsbot-device, serde, serde_json. No other entry changes.
• cargo metadata external crates and versions: diff against before is empty. name, version, license, description, homepage, repository, authors, edition, rust_version of obsbot4linux: diff empty.
• cargo tree -e normal,build,features -p obsbot4linux: external crates and features, diff against before empty (97 lines).
• cargo build --release --locked: file -b target/release/obsbot4linux ends in , stripped.
• Packages are built by the release dry run of this pull request (G5, contents job against the unchanged packaging/contents.txt).
• No camera was used; the binary was not run.

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