Make product checks additive

docs/release.md

@@ -54,9 +54,10 @@ Then run the single publication command from the repository root:
 ./scripts/release vX.Y.Z
 ```
 
-The committed `releasekit.json` selects the offline default test suite:
+The command always runs the offline default test suite,
 `go test -mod=readonly -count=1 ./...`, with toolchain and module network
-access disabled for validation. The command validates once, checks the
+access disabled. Any profile `checks` run afterward as additional product
+checks; they should not repeat the standard suite. The command checks the
 authoritative remote state, creates a local annotated tag from the captured
 candidate and checked-in note, rechecks the tag and remote guards, and pushes
 only that tag object. It prints the published version, commit, and tag object