feat: add snapshots-disks and reorganize wiki docs

[TacoRocket]

Summary

• add the snapshots-disks compute command with priority-first table output, schemas, fixtures, help, and tests
• regroup the README supported-command section for readability and keep public command grouping operator-workflow-based
• move wiki and planning material out of docs and into wiki/seed and wiki/planning/api-mapping

Validation

• python3 -m ruff check src tests scripts
• PYTHONPATH=src python3 scripts/generate_schemas.py
• PYTHONPATH=src python3 -m pytest -o cache_dir=/private/tmp/pytest-cache-dns tests/test_collectors.py tests/test_golden_outputs.py tests/test_contract_schemas.py tests/test_cli_smoke.py tests/test_help.py tests/test_terminal_ux.py tests/test_models.py
• PYTHONPATH=src python3 -m pytest -o cache_dir=/private/tmp/pytest-cache-all
• pre-push guardrail: 157 passed, 2 deselected

Notes

• one clean-context review was completed before publish; it found a PyPI-unfriendly README wiki link, which was fixed before commit
• external reference-doc updates live in the separate AzureFox-reference workspace and are not part of this PR