Post-create CI note:

• Local targeted validation passed (tests/tools/test_terminal_tool.py + tests/tools/test_terminal_tool_description.py).
• Current Windows footguns (blocking) failure is outside this PR diff: it reports tools/process_registry.py:588 (os.killpg(..., signal.SIGKILL)), which this PR does not touch.
• ruff + ty diff reports no new ruff/ty issues, but its comment-post step hit GitHub Actions integration permissions (Resource not accessible by integration).
• e2e failed early; logs were not available while the test workflow was still in progress at the time of this note.

Additional CI triage note (2026-05-12 cron):

• e2e failures are in tests/e2e/test_platform_commands.py session reset assertions (/new not calling runner.session_store.reset_session), not in the PR diff (tools/terminal_tool.py, tests/tools/test_terminal_tool_description.py).
• ruff + ty diff reports 0 new Ruff issues and 0 new ty issues; the job fails while trying to post the lint summary comment (Resource not accessible by integration).
• Windows footguns (blocking) still points to pre-existing tools/process_registry.py:588, outside this PR diff.

Keeping the PR scope narrow unless maintainers ask to address repository-wide failures here.