Add static registry curation metadata

[aidankhogg]

Motivation

• Provide immutable provenance and curation metadata for compact static registries so the core package remains small and clearly documented.
• Capture source_url, a package curation version, and compactness_notes to signal that large external registries should be distributed via optional data packages rather than embedded in core.

Description

• Add an immutable RegistryMetadata dataclass with new fields package_curation_version and compactness_notes and update source_version naming (src/.../static/metadata.py).
• Add metadata constants beside each registry (ARCHITECTURE_ALIASES_METADATA, FILESYSTEMS_METADATA, MEDIA_TYPES_METADATA, OPERATING_SYSTEMS_METADATA, WELL_KNOWN_PORTS_METADATA, IP_PROTOCOL_NUMBERS_METADATA, VENDORS_METADATA) including source_url, package_curation_version, and compactness_notes (src/.../static/*.py).
• Keep registry containers immutable (tuples and MappingProxyType) and do not embed large external registries; document optional companion data packages including computecommons-data-iana, computecommons-data-pci, computecommons-data-usb, and newly documented computecommons-data-oui in README.md.
• Update tests to assert presence and immutability of the new metadata fields (tests/test_static.py).

Testing

• Ran linter checks with python -m ruff check src/computecommons/static tests/test_static.py and they passed.
• Ran focused tests with python -m pytest tests/test_static.py and full test-suite with python -m pytest, and all tests passed (8 passed for the focused run and 93 passed for the full suite).

---

Codex Task