feat: migrate to decibri 5.0.0

[rossarmstrong]

• Cargo.toml: decibri 3.0.0 -> 5.0.0; feature output -> playback; rust-version 1.82.0 -> 1.88; package version 0.1.0 -> 0.2.0; drop unused direct dependency crossbeam-channel
• src/commands/capture.rs: rename to Microphone/MicrophoneConfig/ MicrophoneStream; build config via default() then assign; rework read loop onto next_chunk() so output honors --rate at any device native rate; distinguish device loss via take_last_error() (exit 4); replace the overflow watchdog with overrun_count() wired to JSON dropped_chunks under a complete-and-warn policy; simplify post-stop drain
• src/commands/play.rs: rename to Speaker/SpeakerConfig/SpeakerStream; build config via default() then assign; surface output-device failure during playback as exit 4 via take_last_error()
• src/device_resolve.rs: input_devices()/output_devices(); handle DeviceSelector::Id and a non_exhaustive catch-all
• src/commands/devices.rs: MicrophoneInfo/SpeakerInfo; add id to devices --json
• src/commands/capture.rs + src/commands/play.rs (arg structs): restrict --channels to 1 with an exit-2 mono-only arg error; add --device-id building DeviceSelector::Id
• tests/devices_snapshot.rs: add id to the synthetic payload
• tests: pin mono-only rejection, --device-id help/conflict/no-match paths; remove stale wording
• re-accept version and devices-schema snapshots for the new surface
• build.rs: punctuation cleanup in two panic messages
• CHANGELOG.md: 0.2.0 entry