BuildScript declares every file it writes as rainix-codegen owns <path> #329

rainix's codegen-declaration action, run inside rainix-copy-artifacts, fails a generated path that was declared but not written. That is the half of the currency check a diff cannot do: a generator that stops emitting a file leaves the committed copy alone, so nothing differs (rainlanguage/rain.factory.deploy#35). It only sees paths a generator declares on stdout as rainix-codegen owns <path>, and nothing here declares any, so the check is a no-op for every rain.deploy consumer.

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BuildScript and the LibRainDeploySnapshot writers print rainix-codegen owns <path> for each file they own and write on a run(): the rolling candidate snapshots, the alias and released-suites libs, the aggregate, and the staged config. Frozen src/generated/<tag>/ records are deliberately not rewritten, so they are not declared.

Refs rainlanguage/rain.factory.deploy#35

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