Rebind serial sessions after USB renumber

[zackees]

Closes #642.\n\n## Summary\n- rebind active serial sessions to the new physical port after tracked USB serial renumbering\n- preserve logical session keys, broadcasters, readers, and writer locks across the rebind\n- surface structured port_rebind_failed events when reopening the new port fails\n\n## Tests\n- soldr cargo fmt --all --check\n- soldr cargo check -p fbuild-serial -p fbuild-daemon -p fbuild-python\n- soldr cargo test -p fbuild-serial messages -- --nocapture\n- soldr cargo test -p fbuild-serial manager -- --nocapture\n- soldr cargo test -p fbuild-daemon device_manager -- --nocapture\n- soldr cargo test -p fbuild-daemon handlers::operations::monitor -- --nocapture\n- soldr cargo check -p fbuild-python --all-targets\n- soldr cargo clippy -p fbuild-serial -p fbuild-daemon -p fbuild-python --all-targets -- -D warnings

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 32dae496-84e8-49b6-8cde-65bda18cb3a4

📥 Commits

Reviewing files that changed from the base of the PR and between 4c1ea87 and e102ac1.

📒 Files selected for processing (10)

• crates/fbuild-daemon/src/context.rs
• crates/fbuild-daemon/src/handlers/devices.rs
• crates/fbuild-daemon/src/handlers/operations/deploy.rs
• crates/fbuild-daemon/src/handlers/operations/monitor.rs
• crates/fbuild-daemon/src/handlers/websockets.rs
• crates/fbuild-python/src/json_rpc.rs
• crates/fbuild-python/src/messages.rs
• crates/fbuild-python/src/serial_monitor.rs
• crates/fbuild-serial/src/manager.rs
• crates/fbuild-serial/src/messages.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/serial-session-rebind

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