centralize guides and rails under mosaic with runtime compatibility links

rails/git/pr-close.sh

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+#!/bin/bash
+# pr-close.sh - Close a pull request without merging on GitHub or Gitea
+# Usage: pr-close.sh -n <pr_number> [-c <comment>]
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Parse arguments
+PR_NUMBER=""
+COMMENT=""
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -n|--number)
+            PR_NUMBER="$2"
+            shift 2
+            ;;
+        -c|--comment)
+            COMMENT="$2"
+            shift 2
+            ;;
+        -h|--help)
+            echo "Usage: pr-close.sh -n <pr_number> [-c <comment>]"
+            echo ""
+            echo "Options:"
+            echo "  -n, --number   PR number (required)"
+            echo "  -c, --comment  Comment before closing (optional)"
+            echo "  -h, --help     Show this help"
+            exit 0
+            ;;
+        *)
+            echo "Unknown option: $1"
+            exit 1
+            ;;
+    esac
+done
+
+if [[ -z "$PR_NUMBER" ]]; then
+    echo "Error: PR number is required (-n)"
+    exit 1
+fi
+
+detect_platform
+
+if [[ "$PLATFORM" == "github" ]]; then
+    if [[ -n "$COMMENT" ]]; then
+        gh pr comment "$PR_NUMBER" --body "$COMMENT"
+    fi
+    gh pr close "$PR_NUMBER"
+    echo "Closed GitHub PR #$PR_NUMBER"
+elif [[ "$PLATFORM" == "gitea" ]]; then
+    if [[ -n "$COMMENT" ]]; then
+        tea pr comment "$PR_NUMBER" "$COMMENT"
+    fi
+    tea pr close "$PR_NUMBER"
+    echo "Closed Gitea PR #$PR_NUMBER"
+else
+    echo "Error: Unknown platform"
+    exit 1
+fi