Add GitHub search qualifiers to step 1 for precision

Co-authored-by: Malcolmnixon <1863707+Malcolmnixon@users.noreply.github.com>
Agent-Logs-Url: https://github.com/demaconsulting/TemplateDotNetLibrary/sessions/e1fc18f1-3aff-4aca-8933-bcfbffda955a

Author: Copilot

.github/agents/repo-consistency.agent.md

@@ -18,7 +18,7 @@ consistency gaps, template evolution updates, and recommended changes for the sp
 
 ## Consistency Steps
 
-1. Fetch the last 20 merged pull requests from <https://github.com/demaconsulting/TemplateDotNetLibrary>
+1. Fetch the last 20 merged PRs (`is:pr is:merged`) from <https://github.com/demaconsulting/TemplateDotNetLibrary>
 2. Determine the intent of the template pull requests (what changes were performed to which files)
 3. Apply missing changes to this repository's files (if appropriate and with translation)