Add PR validation before creating PRs

- Create validate-pr.sh: runs shellcheck, JSON/YAML/Python syntax checks
- Update gitea-pr.sh: runs validation before creating PR
- Update CLAUDE.md: document PR review policy
  - ~/.claude repo: linting/validation only
  - Code repos: full code-reviewer agent review

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

automation/gitea-pr.sh

@@ -1,9 +1,11 @@
 #!/bin/bash
 # Create a PR in Gitea for the current branch
 # Usage: gitea-pr.sh [title] [body]
+# Runs validation before creating PR
 
 set -euo pipefail
 
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 GITEA_URL="https://gitea-http.taildb3494.ts.net"
 REPO="will/claude-code"
 TOKEN_FILE="$HOME/.config/gitea-token"
@@ -23,6 +25,14 @@ if [[ "$BRANCH" == "main" ]]; then
     exit 1
 fi
 
+# Run validation
+echo "Running pre-PR validation..."
+if ! "$SCRIPT_DIR/validate-pr.sh"; then
+    echo "Error: Validation failed. Fix issues before creating PR." >&2
+    exit 1
+fi
+echo ""
+
 # Default title from branch name
 TITLE="${1:-$BRANCH}"
 BODY="${2:-Auto-generated PR for $BRANCH}"