chore: Add clarifying note to automated PR bodies (#1623)

Author: jlowin

.github/workflows/marvin-label-triage.yml

@@ -148,7 +148,6 @@ jobs:
       - name: Run Marvin for Issue Triage
         uses: anthropics/claude-code-base-action@beta
         with:
-          model: claude-3-5-haiku-latest
           prompt_file: /tmp/claude-prompts/triage-prompt.txt
           allowed_tools: "Bash(gh label list),mcp__github__get_issue,mcp__github__get_issue_comments,mcp__github__update_issue,mcp__github__get_pull_request_files"
           timeout_minutes: "5"

.github/workflows/update-config-schema.yml

@@ -75,6 +75,8 @@ jobs:
 
             The schema is automatically generated from `src/fastmcp/utilities/fastmcp_config/` to ensure consistency.
 
+            **Note:** This PR is fully automated and will update itself with any subsequent changes to the schema, or close automatically if the schema becomes up-to-date through other means. Feel free to leave it open until you're ready to merge.
+
             🤖 Generated by Marvin
           branch: marvin/update-config-schema
           delete-branch: true

.github/workflows/update-sdk-docs.yml

@@ -58,6 +58,8 @@ jobs:
 
             📚 Documentation is automatically generated from the source code docstrings and type annotations.
 
+            **Note:** This PR is fully automated and will update itself with any subsequent changes to the SDK, or close automatically if the documentation becomes up-to-date through other means. Feel free to leave it open until you're ready to merge.
+
             🤖 Generated by Marvin
           branch: marvin/update-sdk-docs
           delete-branch: true