fix: enforce command queue timeouts

[itzptk]

Summary

• Enforces CommandQueue timeouts by rejecting the queued promise when the timeout deadline expires.
• Aborts the task signal with the same timeout error, clears the timer, and advances the queue exactly once.
• Adds regression coverage for a task that ignores its abort signal and never settles.

Closes #23

Verification

• RED before fix: npm run test:node -- command-queue failed with expected 'pending' to be 'rejected' in times out unresponsive tasks before continuing the queue.
• npm run test:node -- command-queue → passed, 1 file / 2 tests.
• npm run test:node → passed, 15 files / 117 tests.
• npm run test → passed, 114 files / 252 tests. Existing dark-mode media-query warnings appeared on stderr, but the suite exited 0.
• npm run build → passed (ng build --configuration production and tsup --config tsup.config.ts).

Notes

• npm ci did not leave Electron's binary fully extracted in this scheduler worktree; I completed the local Electron extraction from npm's cached Electron zip before running the full node test suite. No tracked files were changed by that environment repair.