chore: sync all changes to Gitea

- Config, docs, scripts, and backup manifests
- Submodule refs unchanged (m = modified content in submodules)

Made-with: Cursor

scripts/complete-validation.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 # Complete Validation Script