Artifact: Minimal AGENTS.md Excerpt

A minimal instruction-file excerpt declaring a build/test command and one convention, followed by proof the next session ran it unprompted -- exercises co-06.

## Build & Test
 
\`\`\`bash
pytest tests/ -q
\`\`\`
 
## Conventions
 
- Every new function must be fully type-annotated (PEP 484).

Next session's tool-call log, opening line:

1. run_shell(command="pytest tests/ -q")

No human message anywhere earlier in that session's transcript restates the test command -- the agent read it directly from AGENTS.md at session start, before any file-specific work began.

Verify: the next session's very first tool call is run_shell(command="pytest tests/ -q") -- the exact command AGENTS.md declared -- and the transcript contains no human message repeating that command anywhere before it -- satisfying ex-07's rule that the agent's next session runs the declared test command without being told.