Goalpost: v19 generated deterministic codec boundary

[flyingrobots]

Thesis slice

Prove that git-warp can consume Bunny/Wesley deterministic contract profiles at adapter boundaries without letting generated wire shapes become domain truth.

Owns

• Consume Bunny/Wesley deterministic contract profile for git-warp codecs #685
• Typed codec port pattern — domain never touches raw bytes for serde #480

Acceptance evidence

• At least one generated deterministic codec boundary pilot exists.
• Valid domain values outside the current Wesley scalar profile fail closed before persistence/signature use.
• Generated DTO/codecs remain at adapter or explicit boundary surfaces.
• Domain behavior receives validated runtime nouns, not raw decoded shapes.

[flyingrobots]

Activated as the next v19 goalpost after #693 closeout. Scope remains #685 and #480: prove a generated deterministic codec boundary pilot and typed codec port pattern without letting generated DTOs become domain truth.