feat: Add documentation files including Code of Conduct, Contributing guidelines, and Security policy; update Markdown linting configuration and scripts

.markdownlint-cli2.jsonc

@@ -1,14 +1,27 @@
-{
-  "config": {
-    "MD013": false,
-    "MD033": false,
-    "MD041": false
-  },
-  "ignores": [
-    ".dev/**",
-    "docs/api/**",
-    "**/node_modules/**",
-    "**/bin/**",
-    "**/obj/**"
-  ]
-}
+{
+  // https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md
+  "config": {
+    "default": true,
+    // Allow long lines (common in docs with URLs and code)
+    "MD013": false,
+    // Allow duplicate headings in different sections
+    "MD024": { "siblings_only": true },
+    // Allow inline HTML (docfx uses it)
+    "MD033": false,
+    // Allow bare URLs
+    "MD034": false
+  },
+
+  "globs": ["**/*.md"],
+
+  "ignores": [
+    ".dev/**",
+    "docs/_site/**",
+    "docs/api/**",
+    "node_modules/**",
+    "**/bin/**",
+    "**/obj/**",
+    "publish/**",
+    ".claude/**"
+  ]
+}