One test stubs the transport a layer below `api()` — at `subprocess`, to
exercise the path a 422 really takes — so it reaches the real payload
write. That used to land in the test's own temp store, because the caller
named the directory; now the directory is `_gitea.PAYLOAD_ROOT`, resolved
from the module's location, and the file appeared in the developer's
`tmp/payload/`.
`StoreTestCase` patches `PAYLOAD_ROOT` to its fixture alongside the other
seams, and the rule in AGENTS.md gains the third directory a test must
not write to.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
naudachu
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