Add process-local JavaScript session monitoring

[cpendery (cpendery)]

Summary

Adds opt-in monitoring for process-local JavaScript terminal sessions, building on #200's interactive monitor client.

• starts one lazy IPC bridge per Node process and exposes monitored sessions through tui-test sessions
• routes frames and raw interactive input to an exact process-owned PTY generation
• keeps one attachment lease across frame reconnects so terminal resize cannot release a failed test early
• keeps failed test terminals available for attachment, waits for connected monitors to detach, then rethrows the original error
• preserves replacement sessions when same-name open, restart, close, and monitor-wait operations overlap
• adds labels and test metadata for discovery plus environment-based monitoring configuration

Dependency

This PR targets cpendery/interactive-monitor and depends on #200.

Validation

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo clippy -p tui-test-rs --all-targets --no-default-features -- -D warnings
• cargo test --workspace -- --test-threads=1
• Node test suite: 68 tests passed
• manual Windows end-to-end check: discovered and attached to a failed process-local session, forwarded raw input, resized the viewer while the attachment lease remained active, detached, and preserved the original error