Prevent model from auto-invoking plannotator slash commands (#586)

Add `disable-model-invocation: true` frontmatter so these user-driven
commands (which open browser UIs and require human interaction) can
only be triggered explicitly by the user, not picked up automatically
by the model.

Author: backnotprop

apps/hook/commands/plannotator-annotate.md

@@ -1,6 +1,7 @@
 ---
 description: Open interactive annotation UI for a markdown file or folder
 allowed-tools: Bash(plannotator:*)
+disable-model-invocation: true
 ---
 
 ## Markdown Annotations

apps/hook/commands/plannotator-archive.md

@@ -1,6 +1,7 @@
 ---
 description: Browse saved plan decisions in the archive
 allowed-tools: Bash(plannotator:*)
+disable-model-invocation: true
 ---
 
 ## Plan Archive

apps/hook/commands/plannotator-last.md

@@ -1,6 +1,7 @@
 ---
 description: Annotate the last rendered assistant message
 allowed-tools: Bash(plannotator:*)
+disable-model-invocation: true
 ---
 
 ## Message Annotations

apps/hook/commands/plannotator-review.md

@@ -1,6 +1,7 @@
 ---
 description: Open interactive code review for current changes or a PR URL
 allowed-tools: Bash(plannotator:*)
+disable-model-invocation: true
 ---
 
 ## Code Review Feedback