[Repo Assist] test: expand threading and heapq test coverage

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Summary

Improves test coverage for two stdlib modules that had significant gaps.

TestThreading.fs — 3 tests → 16 tests (+13)

The existing file only tested get_ident, active_count, and local. None of the three concrete classes (Lock, RLock, Event) or the Thread class had any test coverage. New tests cover:

Area	Tests added
Lock	acquire/release lifecycle; locked() state tracking; non-blocking acquire returns false when already held
RLock	acquire/release; reentrancy (same thread acquires twice)
Event	initial state is false; set/clear toggle is_set; wait returns true when already set; wait(timeout=0.0) returns false when not set
Thread	target function runs and result is visible after join; is_alive reflects lifecycle (false → true → false); name property; daemon default
Module fns	main_thread, current_thread, enumerate

TestHeapq.fs — 5 tests → 7 tests (+2)

heapreplace (pop smallest, push new item atomically) had no tests. New tests verify:

• return value is the old root
• heap invariant is maintained after the replace

Files changed

• test/TestHeapq.fs — 2 new tests for heapreplace
• test/TestThreading.fs — 13 new tests covering Lock, RLock, Event, Thread, and threading module functions

No bindings were changed; this is a test-only PR.

Note: CHANGELOG.md is intentionally not updated per repository policy.

CI will validate the build and Python tests.

Note

🔒 Integrity filter blocked 10 items

The following items were blocked because they don't meet the GitHub integrity level.

• support for asynchronous context managers #134 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• allow TextIOWrapper to be enumerated #131 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• auto pip installation of dependencies during compilation of scripts #117 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• typeshed: generate bindings automatically ~ python glutinum? #115 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Pandas binding #65 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Support for Attributes? #48 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• string format specifier '{i:X4}' not working #36 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Create Pyi parser #22 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Roadmap #15 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• How does it generate the python source from AST? #5 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

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