fix(operator): count guidance paths by filesystem type in adopt plan

[solomonneas]

Summary

• Fix brigade operator adopt plan guidance inventory so directories like memory/cards are classified with is_dir() and never inflate the guidance_files summary count.
• Count present_count / present_dir_count from actual filesystem types instead of a hardcoded path set.
• Apply the same directory-only rule to local_state inventory paths.
• Extend regression coverage with a fixture containing card files under memory/cards/.

Closes #479

Test plan

• ./scripts/verify
• pytest tests/test_operator_cmd.py::test_adopt_plan_counts_guidance_files_and_dirs_separately -xvs

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