Judge ADR 0326 §3 only where a definition is written (hq issue 574)

ParseManifest also reads stored builds again: a build's manifest at a
commit, the gate, a release, a module put back. betterbird's builds from
before its accounts file named its keys would have become uncomposable
there, so a send to g14 or shanks could fail and a rollback be refused.
The refusal now runs in module check, module add, a build taken in, the
builder and the merge gate's registration, and a file is no longer
reported by both §2 and §3.

testdata/store-tests

@@ -37,3 +37,4 @@
 ./cmd/mesh-controller TestReplay401
 ./cmd/mesh-controller TestReplay201ThePlansSend
 ./internal/inventory TestAWalksRestIsReadFromEachMachinesOwnSend
+./internal/inventory TestAStoredBuildWithASilentMergeableFileIsStillReadAndComposed