Module args 

Per-signal argument schema validation (gsp_rfc §6, §11).

Each signal type has defined arg requirements:

• JOIN, LEAVE — args MAY be empty; no required keys.
• ROLE_CHANGE — args MUST be a CBOR map with keys 0 (target_member_id) and 1 (new_role).
• MUTE, UNMUTE — args MUST be a CBOR map with key 0 (target_member_id).
• STREAM_START, STREAM_STOP — args MUST be a CBOR map with key 0 (stream_type).
• CODEC_UPDATE — args MUST be a CBOR map with key 0 (codec_id).

Functions

validate_args

Validates the args bytes for the given signal type.