Add `Code.status` and `Code.description` properties

[sumanjeet0012]

The Code class exposes name and tag() but not status (permanent/draft) or description metadata. go-multicodec includes this information in generated code comments.

Problem

from multicodec import Code

code = Code(0x12)
code.name    # "sha2-256" ✅
code.tag()   # "multihash" ✅
code.status  # ❌ Not available
code.description  # ❌ Not available

go-multicodec includes this metadata in generated comments:

// Sha2_256 is a permanent code tagged "multihash".
Sha2_256 Code = 0x12 // sha2-256

// Shake128 is a draft code tagged "multihash".
Shake128 Code = 0x18 // shake-128

Knowing whether a codec is permanent vs draft is useful for applications that want to enforce stability guarantees.

Proposed Solution

1. Prerequisite: constants.py must include status and description fields (see related issue).

2. Add properties to Code class in code.py:

   @property
   def status(self) -> str:
       """Return 'permanent', 'draft', or '<unknown>'."""
       info = CODECS.get(CODE_TABLE.get(self._value, ""), {})
       return info.get("status", "<unknown>")
   
   @property
   def description(self) -> str:
       """Return the codec description from the multicodec table."""
       info = CODECS.get(CODE_TABLE.get(self._value, ""), {})
       return info.get("description", "")

3. Add tests in tests/test_code.py.

Related

• Issue: constants.py entries lack status and description metadata
• Issue: tools/update-table.py discards CSV columns
• Go equivalent: Generated code comments in code_table.go