feat(ai): share agent preferences across tools and add link-ai-configs.sh

Adds .config/ai/AGENTS.md, Claude's global CLAUDE.md, settings and OMC
preferences, a script that symlinks them into HOME with backups, and the
README section that documents the restore.

.config/claude/settings.json

@@ -0,0 +1,62 @@
+{
+  "env": {
+    "CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS": "1"
+  },
+  "model": "opus",
+  "statusLine": {
+    "type": "command",
+    "command": "sh ${CLAUDE_CONFIG_DIR:-$HOME/.claude}/hud/omc-hud-cache.sh ${CLAUDE_CONFIG_DIR:-$HOME/.claude}/hud/omc-hud.mjs"
+  },
+  "enabledPlugins": {
+    "oh-my-claudecode@omc": true,
+    "frontend-design@claude-plugins-official": true,
+    "superpowers@claude-plugins-official": true,
+    "typescript-lsp@claude-plugins-official": true,
+    "playwright@claude-plugins-official": true,
+    "rust-analyzer-lsp@claude-plugins-official": true,
+    "pyright-lsp@claude-plugins-official": true,
+    "security-guidance@claude-plugins-official": true,
+    "chrome-devtools-mcp@claude-plugins-official": true,
+    "searchfit-seo@claude-plugins-official": true,
+    "skill-creator@claude-plugins-official": true,
+    "gopls-lsp@claude-plugins-official": true,
+    "csharp-lsp@claude-plugins-official": true,
+    "jdtls-lsp@claude-plugins-official": true,
+    "php-lsp@claude-plugins-official": true,
+    "clangd-lsp@claude-plugins-official": true,
+    "swift-lsp@claude-plugins-official": true,
+    "kotlin-lsp@claude-plugins-official": true,
+    "lua-lsp@claude-plugins-official": true,
+    "remember@claude-plugins-official": true,
+    "mcp-server-dev@claude-plugins-official": true,
+    "claude-notifications-go@claude-notifications-go": true,
+    "linear@claude-plugins-official": true
+  },
+  "extraKnownMarketplaces": {
+    "omc": {
+      "source": {
+        "source": "git",
+        "url": "https://github.com/Yeachan-Heo/oh-my-claudecode.git"
+      }
+    },
+    "claude-plugins-official": {
+      "source": {
+        "source": "git",
+        "url": "https://github.com/anthropics/claude-plugins-official.git"
+      }
+    },
+    "claude-notifications-go": {
+      "source": {
+        "source": "github",
+        "repo": "777genius/claude-notifications-go"
+      }
+    }
+  },
+  "effortLevel": "xhigh",
+  "awaySummaryEnabled": false,
+  "tui": "fullscreen",
+  "skipDangerousModePermissionPrompt": true,
+  "verbose": true,
+  "teammateMode": "in-process",
+  "remoteControlAtStartup": false
+}