[Test Improver] test: add unit tests for BaseIntegrator utility methods

[danielmeppiel]

Summary

This PR adds direct unit tests for BaseIntegrator utility methods in src/apm_cli/integration/base_integrator.py that were previously exercised only indirectly through subclass integration tests.

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🤖 Test Improver — I'm an automated AI assistant. This PR was generated as part of systematic test coverage improvement.

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Goal and Rationale

BaseIntegrator is the shared infrastructure for all file-level integrators (prompts, agents, skills, hooks, instructions, commands). Its utility methods are on the critical path for install, sync, and uninstall operations across every target. While these methods had indirect coverage through the many integrator subclass tests, they lacked dedicated unit tests that:

• Exercise each method in isolation
• Cover edge cases not triggered by normal integrator workflows (e.g. cleanup_empty_parents with nonexistent paths, find_files_by_glob deduplication, check_collision with a diagnostics object)
• Document expected behaviour as executable specifications

Approach

New test file: tests/unit/integration/test_base_integrator.py

Class	Methods tested	Tests
TestIntegrationResult	dataclass defaults / custom values	2
TestCleanupEmptyParents	empty list noop, bottom-up removal, stop_at boundary, sibling preservation, nonexistent paths	7
TestFindFilesByGlob	pattern matching, subdir search, deduplication, missing-path safety, sorted output	7
TestNormalizeManagedFiles	None passthrough, backslash normalization, mixed separators, empty set	5
TestCheckCollisionDiagnostics	diagnostics.skip() vs _rich_warning routing	3
TestResolveLinks	no-resolver path, unchanged-content zero count, link count, init exception, init success	5
TestShouldIntegrate	always-True default	1
Total		30

Coverage Impact

No coverage tooling run (avoids PyYAML global state corruption from --cov). All 30 new tests target previously untested code paths in base_integrator.py.

Test Status

30 passed in 0.29s
3644 passed in 17.61s  (full unit suite)

All tests pass. No production code changed.

Reproducibility

# Run new tests only
uv run pytest tests/unit/integration/test_base_integrator.py -v

# Full unit suite
uv run pytest tests/unit tests/test_console.py -x -q

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