Three separate sites printed the identical 'cannot read repository: repository is corrupt' -- deriving the view, reopening the log, and applyCheckin. So a materialization failure was indistinguishable from a failure to read the repository, which is a different claim about a different subsystem.

stagePlan's three refusals now return FileContentMissing carrying the file path and the artifact name: a file the check-in references has no artifact here, or has none stored, or the stored bytes do not match the name. verify cannot surface any of these -- it checks that stored artifacts are valid, never that referenced ones exist.

Being in the closed ApplyError set, the compiler required all four verb mappers to handle it. (#42) check-in: 0b7b4af7fe user: dmestas tags: sub-manifest