fix(doc-freshness-check): expand allowed-files to docs, README, prompts (#463)

* Initial plan

* fix(doc-freshness-check): expand allowed-files to docs, README, prompts

Agent-Logs-Url: https://github.com/githubnext/ado-aw/sessions/ad44c9bf-be66-4d60-a8ca-928a59e2474f

Co-authored-by: jamesadevine <4742697+jamesadevine@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jamesadevine <4742697+jamesadevine@users.noreply.github.com>

Author: Copilot

.github/workflows/doc-freshness-check.lock.yml

@@ -16,6 +16,9 @@ safe-outputs:
     max: 1
     allowed-files:
       - AGENTS.md
+      - README.md
+      - docs/**
+      - prompts/**
 ---
 
 # Documentation Freshness Check