docs: publish Tend Compose continuity evidence

Export the reviewed allowlisted snapshot from private source commit 07c1655921f21ee5e4fc4d85639d199e8867b17d. This records the Docker Compose activation, schema-compatible rollback, and stateful migration resource findings from Observatory Preview 19 dogfooding.

AI-Assisted: OpenAI Codex
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

internal/deploy/ownership_other.go

@@ -0,0 +1,17 @@
+//go:build !linux
+
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package deploy
+
+import "os"
+
+type fileIdentity struct{ mode os.FileMode }
+
+func identityFor(info os.FileInfo, fallback os.FileMode) fileIdentity {
+	if info != nil {
+		return fileIdentity{mode: info.Mode().Perm()}
+	}
+	return fileIdentity{mode: fallback}
+}
+func applyIdentity(file *os.File, identity fileIdentity) error { return file.Chmod(identity.mode) }