fix: re-fetch PR details in enricher to avoid stale requested_reviewers

CHANGELOG.md

@@ -8,6 +8,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ### Fixed
 
+- **Stale PR data in CODEOWNERS checks** -- `PullRequestEnricher` now
+  re-fetches PR details via `GET /repos/:owner/:repo/pulls/:num` before
+  building `event_data`, replacing the webhook payload's `requested_reviewers`
+  (and other point-in-time fields) with the current state. Fixes a race where
+  a `synchronize` webhook processed just before a `review_requested` webhook
+  would see a stale `requested_reviewers` list and incorrectly flag
+  `PathHasCodeOwnerCondition` / `RequireCodeOwnerReviewersCondition`
+  violations. Falls back to the webhook payload if the refresh fails.
+
 - **`FilePatternCondition._get_changed_files` implementation** -- Replaced
   stub that always returned `[]` with a working implementation that extracts
   file paths from enriched PR data (`changed_files` list of dicts or plain

src/event_processors/pull_request/enricher.py

@@ -55,6 +55,16 @@ async def enrich_event_data(self, task: Any, github_token: str) -> dict[str, Any
         repo_full_name = getattr(task, "repo_full_name", "")
         installation_id = getattr(task, "installation_id", 0)
 
+        # the current state, not the stale webhook snapshot (webhooks for
+        # synchronize + review_requested can race).
+        if pr_number and repo_full_name:
+            try:
+                fresh_pr = await self.github_client.get_pull_request(repo_full_name, pr_number, installation_id)
+                if fresh_pr:
+                    pr_data = fresh_pr
+            except Exception as e:
+                logger.warning(f"Could not refresh PR #{pr_number} details: {e}")
+
         # Base event data
         event_data = {
             "pull_request_details": pr_data,