Local fixture validation: 2026-09-10
Runtime: v24.18.0
Platform: Darwin arm64
Third-party dependencies: none
Environment: fresh temporary directory, loopback servers only

$ node check.mjs
valid signature: 204
wrong, malformed, missing signatures: 401
body changed after signing: 401
signed invalid JSON: 400
response dropped after storage: client fetch rejected
same key and payload: 200 exp_1
same key, changed format: 409
new key for same format: 202 exp_2
stored state: {"exports":2,"events":1}
partial upload disconnected: server alive, prior state intact
body limits: 4096 bytes accepted, 4097 bytes rejected; rejected body not stored
replayed valid event: 204; event count increased from 1 to 2
new fixture state: {"exports":0,"events":0}
PASS

exit=0

Scope: synthetic fixture behavior; no human usability study or production claim.