[Test Improver] test: add unit tests for deps/_utils.py utility functions

[danielmeppiel]

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Goal

apm_cli/commands/deps/_utils.py contained utility functions with minimal test coverage (~50%). These pure filesystem helpers are used by the deps list, deps tree, deps info, and view commands, making them important to validate independently.

Approach

Added 43 unit tests in tests/unit/test_deps_utils.py covering all 8 utility functions:

Function	Tests	Key scenarios
_scan_installed_packages	7	empty dir, nonexistent path, GitHub/ADO-style layouts, hidden dirs, multi-package
_is_nested_under_package	3	top-level, nested under parent with apm.yml
_count_primitives	10	prompts, instructions, agents, skills (SKILL.md), hooks in root/apm dir, mixed
_count_package_files / _count_workflows	6	no .apm dir, instructions as context, prompts as workflows, root-level prompts
_get_detailed_context_counts	5	no .apm dir, each type, combined; note context/ dir -> contexts key
_get_package_display_info	4	valid apm.yml, missing apm.yml, display_name format, corrupt yaml fallback
_get_detailed_package_info	8	full info, no apm.yml, hooks, absolute install_path, error recovery

One insight from writing the tests: _scan_installed_packages only skips candidate directories whose own name starts with . — it still traverses into hidden parent directories. Tests document this actual behavior.

Coverage Impact

• Before: deps/_utils.py covered indirectly via test_deps_list_tree_info.py (partial, ~50% estimated)
• After: All 8 functions directly tested with explicit edge-case coverage

Test Status

All 3866 tests pass (3823 baseline + 43 new):

python3 -m uv run pytest tests/unit tests/test_console.py -x -q
3866 passed in 19.67s

Reproducibility

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

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

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