Track remaining node:timers parity gaps

[TheHypnoo]

Summary

Follow-up for the granular node:timers parity work: the current timers suite covers the passing deterministic surface, but a few deeper Node parity gaps should be implemented before adding their corresponding fixtures.

Remaining gaps

1. Numeric timer clears

   • clearTimeout(+timeout) should clear a timeout handle by its primitive numeric id.
   • clearInterval(+interval) should clear an interval handle by its primitive numeric id.
   • Related cross-clear shapes should also be validated once numeric clears work.

2. Timer callback this binding

   • Node invokes setTimeout / setInterval callbacks with this bound to the Timeout object.
   • Perry currently executes timer callbacks without exposing that Timeout-shaped receiver.

3. Full node:timers import surface

   • Add parity for namespace/default imports:
     • import * as timers from "node:timers"
     • import timers from "node:timers"
     • prefixless timers namespace/default imports
   • Ensure function identity and callable namespace properties match Node where practical.

4. Deeper node:timers/promises semantics

   • setTimeout(ms, value) should resolve with value.
   • setImmediate(value) should resolve with value.
   • setInterval(ms, value) should behave as an async iterator yielding value.
   • AbortSignal/options coverage should be added after the value and iterator paths are stable.

Acceptance criteria

• Add focused TypeScript fixtures under test-parity/node-suite/timers for each fixed behavior.
• Keep ./run_parity_tests.sh --suite node-suite --module timers at 100% without adding new known_failures entries.
• Prefer small runtime fixes in the same PR as the fixtures when practical.