One OpenAI Responses call (designer model + native image_generation tool)
mints a collectible card PNG; the existing agent_snapshot encoder injects
the buzz_agent_snapshot chunk so the card IS an importable .agent.png.
Boundary rules (agreed with Wren):
- Snapshot construction/injection reuses agent_snapshot.rs; no card-only
wire format.
- Memory exclusion is structural (MemoryLevel::None at build).
- 10 MiB .agent.png ceiling enforced on FINAL bytes post-injection.
- Round-trip verification decodes final bytes and compares the manifest.
- OPENAI_API_KEY resolved via existing env layering (record > persona >
global > process), never leaves Rust, never logged.
- Card frame template embedded via include_bytes! (generation input only);
test gate asserts it decodes with the expected shape.
Co-authored-by: Tyler Longwell <tlongwell@block.xyz>
Signed-off-by: Tyler Longwell <tlongwell@block.xyz>
