[Repo Assist] test: fix pyright strict-mode errors in tests/test_scheduler/; remove from pyright exclude

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Summary

This is Stage 3 of the test linting plan (see TEST_LINTING_PLAN.md): add pyright strict-mode type annotations to all 14 test files in tests/test_scheduler/ so the directory can be removed from pyright's exclude list.

Changes

14 test files annotated

• Added -> None return types to all test methods and __init__ methods
• Typed all action(scheduler, state) callbacks: (abc.SchedulerBase, Any) -> abc.DisposableBase | None
• Typed all handler(_) callbacks: (_: Exception) -> bool
• Typed periodic action callbacks with appropriate state types
• Added from typing import Any and from reactivex import abc imports where needed
• Typed CatchSchedulerTestScheduler class attributes and overridden methods
• Typed Timestamped helper class and module-level helper functions in test_historicalscheduler.py
• Typed nested action functions throughout

pyproject.toml

• Removed "tests/test_scheduler" from the [tool.pyright] exclude list
• Added "tests/test_scheduler/test_mainloop" (GUI library tests stay excluded — they require external dependencies like tkinter, gtk, wx, etc.)

What's excluded and why

tests/test_scheduler/test_mainloop/ remains excluded — these tests require optional GUI libraries (tkinter, gtk, wx, qt, etc.) not available in CI, and fixing them would require conditional imports.

Testing

All 115 scheduler tests pass (16 skipped as expected for flaky CI tests). CI will run the full suite via uv run pytest and validate types with uv run pyright.

Progress toward full test suite coverage:

• ✅ Stage 1: test_core, test_disposables, test_testing
• ✅ Stage 2: test_integration, test_subject
• ✅ Stage 3: test_scheduler (this PR)
• ⏳ Stage 4: test_observable (142 files, in separate PR test: fix all ruff lint errors in tests/test_observable/; remove from ruff exclude #778 for ruff; pyright still TODO)

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Warning

Protected Files

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Protected files

• pyproject.toml

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Note

🔒 Integrity filter blocked 8 items

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

• #749 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #748 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #742 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #736 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #711 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #700 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #698 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #634 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
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