feat: publish Tend v0.2 preview source

Publish the reviewed allowlisted snapshot whose exact binary completed maintenance deployment, rollback, and reactivation exercises for Gamertan and Sandwich Hime.

Private-Source-Commit: 4d7094c8b7c61991bfb67b11fc1558724c874eb2

Private-Source-Tree: 54a2f74804f7acddf3755d7d4da5b97f5fc28381

AI-Assistance: OpenAI Codex assisted implementation, testing, security review, and release verification.
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

internal/serverpolicy/ownership_other.go

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+//go:build !linux
+
+package serverpolicy
+
+import "os"
+
+func rootOwned(os.FileInfo) bool { return false }