feat(akroasis): radio CLI — read, program, export, import, detect

[forkwright]

Summary

Wire the full syntonia stack into user-facing akroasis radio subcommands, completing the CLI integration layer for P1-07.

Changes

• cli.rs (new) — Cli struct + Command enum + RadioArgs wrapper for nested clap subcommands
• radio/mod.rs (new) — RadioCommand enum, ExportFormat, RadioVariant model, DetectedRadio, Hardware/Session traits, StubHardware, resolve_target() helper, dispatch()/dispatch_with()
• radio/errors.rs (new) — 15-variant RadioError enum with user-friendly messages and actionable fix suggestions (snafu)
• radio/detect.rs (new) — detect subcommand, prints discovered radios with variant/port/firmware/warnings
• radio/read.rs (new) — read subcommand, downloads EEPROM image with progress bar, decodes channels, prints comfy-table
• radio/program.rs (new) — program subcommand, loads TOML/JSON plan, validates against radio constraints, confirms with user, uploads + verifies
• radio/export.rs (new) — export to TOML/JSON/CSV/CHIRP-CSV with proper tone/duplex mapping (20-column CHIRP format)
• radio/import.rs (new) — import from TOML/JSON/CHIRP-CSV/binary image with format auto-detection
• radio/progress.rs (new) — indicatif progress bar helpers for download/upload
• main.rs — refactored to use cli::Cli + radio::dispatch(), added RadioError integration

Design decisions

• Trait-based hardware abstraction: Hardware + Session traits allow full testing without serial hardware. StubHardware returns HardwareNotAvailable until P1-02..P1-06 protocol layers land.
• CHIRP interop: 20-column CSV export/import matches CHIRP's format exactly, enabling round-trip with existing radio programming tools.
• Safety-first programming: dialoguer confirmation before writing, post-upload verification by re-reading image, forbidden calibration address protection.

Test plan

• cargo fmt --all -- --check passes
• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test --workspace passes (207 tests, 27 in akroasis)
• 6 CLI parsing tests (all subcommands + missing required args)
• 3 error message tests (no radio, permission denied, forbidden address)
• 2 detect tests (no radios, multiple radios)
• 2 read tests (channel table display, tone formatting)
• 3 export tests (CHIRP 20-column, native CSV header, CTCSS tone column)
• 8 import tests (5 format detection, CSV parsing, roundtrip, TOML import)
• 3 program tests (plan loading, unsupported format, validation)

🤖 Generated with Claude Code

[github-actions]

⚠️ Large PR detected — 23 files, 3218 lines changed.

Consider splitting into smaller PRs for easier review. Not a blocker, just a signal.