Yodel Protocol v1.0-draft.1

First draft release of the Yodel protocol specification.

What's included

• Human-readable spec (v1/spec.md)
• OpenAPI 3.1 machine-readable spec (v1/openapi.yaml)

Changes since initial commit

• fix: use const instead of single-value enum for stream field (#3)
• fix: clarify client behavior when TTS is not generated (#2)
• fix: replace localStorage with secure storage recommendation (#1)

Known open issues

• #4: yodel.context reserved field — under discussion, will be resolved during SDK development