Spec review r1 (H1): the `--out` flag would have changed the only file
guarded by `captureScriptSha256` and reddened check-docs on its own. The
identical-accept mode now leaves demo/docs/capture.mjs as is (frames are
backed up and restored around the standard capture) and takes
`captureScriptSha256` from the candidate manifest together with the
source fingerprint; the docs re-acceptance for this issue is the first
local --identical run in the same branch.
Issue: #512
User-Visible: no