synthetic-schema-deviation expectations (manually calculated, synthetic)

A top-level shape differing from the documented schema rejects the whole file, with session_schema_deviation:

• session-sid-not-string.json: sessionId is not a string. Detection checks key names only; scanning validates types.
• session-msgs-not-array.json: messages is not an array.

Expectations

• Both files have files[*].status=“pending”; no imported events or cursor advancement.
• Two diagnostics, code=session_schema_deviation, one per file.