Read-only integrity check, the safety net for the stage-2 store migration.
Default mode (current project) cross-checks $PWD/.secrets.json against the
store both ways — declared-but-missing blobs and orphaned blobs (no manifest
entry) — and decrypt-tests every dotenv + external blob with the current key,
streaming plaintext to /dev/null so nothing is ever written to disk. `verify
--all` decrypt-tests every blob in every project (integrity only; the store
carries no manifests, so consistency can't be checked store-wide). Both
recurse the whole project tree (find -type f), the same walk rekey/list use,
so nested manifest blobs are covered. Exits non-zero on any finding so it can
gate `migrate --finalize` and CI.
12 bats tests (clean, nested+external, missing blob, decrypt failure, orphan,
missing external, no-manifest die, symlink refusal, --all clean/corrupt/orphan,
nested decrypt failure). Full suite 205/205. bash 3.2 clean.
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