Refactor state reset calls into shared pytest fixture

[Copilot]

Manual clear_base_renderer_cache() and clear_function_apis_registry() calls scattered across test files to prevent cross-test pollution. Consolidates these into a single autouse fixture.

Changes

• conftest.py: Added reset_state() fixture with autouse=True that executes both clear functions before each test
• test_symbol_exposure.py: Removed manual clear calls (now handled by fixture)
• test_cli.py: Removed manual clear calls from 10 test functions

Impact

All 15 test files in numbast/src/numbast/tools/tests/ now automatically reset state before each test. Single point of maintenance for state reset logic.

@pytest.fixture(autouse=True)
def reset_state():
    """Reset global state before each test to avoid cross-test pollution."""
    clear_base_renderer_cache()
    clear_function_apis_registry()
    yield

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Refactor state reset calls into a shared pytest fixture</issue_title>
<issue_description>## Description

In numbast/src/numbast/tools/tests/test_symbol_exposure.py, the test manually calls clear_base_renderer_cache() and clear_function_apis_registry() at the start to avoid cross-test pollution.

Proposed Change

Refactor these calls into a shared pytest fixture (optionally with autouse=True) that can be:

• Placed in the test module or a conftest.py
• Automatically run before each test to guarantee state reset
• Centralized for reuse across multiple tests if needed

Context

• PR: Allow Prefix Removal for Struct and Enums #259
• Discussion: Allow Prefix Removal for Struct and Enums #259 (comment)
• Requested by: @isVoid

Implementation Notes

The fixture should:

1. Import and execute clear_base_renderer_cache() from numbast.static.renderer
2. Import and execute clear_function_apis_registry() from numbast.static.function
3. Yield control to allow for future teardown/cleanup logic if needed
4. Consider using autouse=True to automatically apply to all tests in scope</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Refactor state reset calls into a shared pytest fixture #260

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