feat(omo): track omo config, hooks and workspace slash commands

Adds /owt-done (close Linear issues after merge, then owt done) and
/linear-sync (progress comment and status, no cleanup), linked into omo
as ~/.omo/agent/prompts.

.config/omo/hooks.json

@@ -0,0 +1,18 @@
+{
+  "hooks": {
+    "Stop": [
+      {
+        "hooks": [
+          { "type": "command", "command": "~/.local/bin/omo-notify", "timeout": 10 }
+        ]
+      }
+    ],
+    "Notification": [
+      {
+        "hooks": [
+          { "type": "command", "command": "~/.local/bin/omo-notify", "timeout": 10 }
+        ]
+      }
+    ]
+  }
+}