🧹 Recover unique value from closed conflicted PRs

[undivisible]

Port the unique tests and helper extracts from closed, conflicted PRs onto current main. Merge/lockfile/as_chunks noise is left behind.

Recovered from:

• 🧪 test: add missing tests for CancellationToken #28 CancellationToken unit test
• 🧪 Add error testing for CdpConfig::host_isolated_localhost #32 host_isolated_localhost invalid-config tests
• 🧹 [code health] Refactor overly long run function in main.rs #34 CLI run command helpers
• 🧹 Refactor capabilities function for readability #36 linux/non-linux capabilities helpers
• 🧹 [Code Health] Refactor status function in src/lib.rs #37 generate_interrupted_ack
• 🧹 Refactor: Split overly long test function for protocol debug output #38 split protocol debug redaction tests
• 🧹 Refactor native_click function by extracting platform logic #39 native_click platform helpers
• 🧹 Refactor overly long hotkey function into platform-specific helpers #40 hotkey platform helpers
• 🧹 Refactor overly long native_screen_content_hash function #41 Windows screen capture module
• 🧹 Refactor long capabilities test into smaller isolated tests #43 split CDP capabilities live-ownership tests

Behavior is unchanged. cargo test and cargo fmt --check pass locally.

---

Note

Low Risk
Mechanical extractions and added/split unit tests; PR states behavior is unchanged and tests pass locally.

Overview
Ports refactors and tests from closed conflicted PRs onto main without changing runtime behavior.

Refactors: CLI match arms in main.rs move into run_* helpers; NativeExecutor::capabilities splits into linux_capabilities / non_linux_capabilities; ledger interruption ack building moves to generate_interrupted_ack; platform hotkey, mouse click, and Windows screen-hash logic move to win_hotkey / mac_hotkey, native_click_*, and new windows_capture.rs.

Tests: Adds CancellationToken and host_isolated_localhost invalid-config coverage; splits CDP capability/ownership assertions into separate cases (pre-observation, post-observation, expiry, lost ownership, stale generation); splits protocol Debug redaction tests by concern (authority, request, actions).

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