Add plannotator extension v0.19.10

extensions/plannotator/skills/plannotator-annotate/SKILL.md

@@ -0,0 +1,23 @@
+---
+name: plannotator-annotate
+description: Open Plannotator's annotation UI for a markdown file, converted HTML file, URL, or folder and then respond to the returned annotations.
+---
+
+# Plannotator Annotate
+
+Use this skill when the user wants to annotate a document in Plannotator instead of reviewing it inline in chat.
+
+Run:
+
+```bash
+plannotator annotate <path-or-url>
+```
+
+Behavior:
+
+1. Launch the command with Bash.
+2. Wait for the browser review to finish.
+3. If annotations are returned, address them directly.
+4. If the session closes without feedback, say so briefly and continue.
+
+Do not ask the user to paste a shell command into the chat. Run the command yourself.