- unsafe SQLite (3.46.1 interpreter) keeps exit 0 + sqlite_runtime follow-up but never
enters multiplex auto-migration; healthy 3.53.1 control does.
- a late PermissionError on the profile config write is a config_migration follow-up,
keeps the tail pending and withholds the install stamp.
- an old-schema handoff receipt keeps the previous run's manual-serve debt (1 -> 1).
- historical takeover: a real TypeScript build failure is a build follow-up, exit 0,
config migration + fleet restart still run (rewritten from the old exit-1 pin).
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