digital-drosophila/models/male-cns-lif/wholebrain-plastic-interface-v1/PREPARATION.md

Pre-registration engineering checks

No new brain trajectory or conditioning result existed during these repairs. Only the new, unregistered AM code was changed; all prior models remained read-only. The new experiment root was provisioned empty and owned by the existing project user before preparation.

The first server-only unit test run had 74 tests: 73 passed, one failed (test_static25_repeat_and_single_validation, copied-input SHA mismatch). The local machine had not reproduced that failure. A direct synthetic probe established the cause, rather than changing a tolerance or expected result:

• A temporary NPZ was overwritten with different, same-size (556-byte) data.
• Its device, inode, length, mtime_ns and ctime_ns were identical before/after.
• The fresh SHA changed from 38219e908f1b500423c9fe1a70b6070103f878903c5f005c79e387fca8b449c4 to fa45373dd04bf5f9d574a5329d42f8259c99c70aa69b077673aaef8c95bf0a02.
• The timestamp-keyed digest cache returned the former SHA for the latter bytes. Both timestamps were 1790749632756475909 in the observed probe.

The new comparator was corrected to read fresh bytes for SHA verification and to include content hashes in static cache identity. A deliberate same-stat, same-length rewrite test guards this issue. No waiting/sleep workaround, relaxed hash equality, modified old data, or scientific rerun is used to hide it.

This note is a human-readable preparation record, not a saved raw unit-test transcript. The subsequent complete server test transcript is recorded during formal preparation and must pass without skipped Torch compatibility tests.