fix: Handle new label dict format in PRAgent

PRAgent was trying to use dict as hashable key, causing TypeError.
Added _get_label_config() helper to support both old string and new
dict format, matching the fix in IssueAgent.

tools/ai-review/agents/pr_agent.py

@@ -40,6 +40,37 @@ class PRAgent(BaseAgent):
     # Marker specific to PR reviews
     PR_AI_MARKER = "<!-- AI_PR_REVIEW -->"
 
+    def _get_label_config(self, category: str, key: str) -> dict:
+        """Get full label configuration from config.
+
+        Args:
+            category: Label category (type, priority, status)
+            key: Label key within category (bug, high, ai_approved, etc.)
+
+        Returns:
+            Dict with name, color, description, aliases
+        """
+        labels_config = self.config.get("labels", {})
+        category_config = labels_config.get(category, {})
+        label_config = category_config.get(key, {})
+
+        # Handle old string format
+        if isinstance(label_config, str):
+            return {
+                "name": label_config,
+                "color": "1d76db",  # Default blue
+                "description": "",
+                "aliases": [],
+            }
+
+        # Handle new dict format
+        return {
+            "name": label_config.get("name", ""),
+            "color": label_config.get("color", "1d76db"),
+            "description": label_config.get("description", ""),
+            "aliases": label_config.get("aliases", []),
+        }
+
     def can_handle(self, event_type: str, event_data: dict) -> bool:
         """Check if this agent handles the given event."""
         # Check if agent is enabled
@@ -185,7 +216,7 @@ class PRAgent(BaseAgent):
             },
             {
                 "name": "Hardcoded IP",
-                "pattern": r'\b(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b',
+                "pattern": r"\b(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b",
                 "severity": "LOW",
                 "category": "Security",
                 "description": "Hardcoded IP address detected",
@@ -193,7 +224,7 @@ class PRAgent(BaseAgent):
             },
             {
                 "name": "Eval Usage",
-                "pattern": r'\beval\s*\(',
+                "pattern": r"\beval\s*\(",
                 "severity": "HIGH",
                 "category": "Security",
                 "description": "Use of eval() detected - potential code injection risk",
@@ -201,7 +232,7 @@ class PRAgent(BaseAgent):
             },
             {
                 "name": "Shell Injection",
-                "pattern": r'(?i)(?:subprocess\.call|os\.system|shell\s*=\s*True)',
+                "pattern": r"(?i)(?:subprocess\.call|os\.system|shell\s*=\s*True)",
                 "severity": "MEDIUM",
                 "category": "Security",
                 "description": "Potential shell command execution - verify input is sanitized",
@@ -373,7 +404,9 @@ class PRAgent(BaseAgent):
             lines.append("### Security Issues")
             lines.append("")
             for issue in review.security_issues[:5]:
-                lines.append(f"- **[{issue.severity}]** `{issue.file}:{issue.line}` - {issue.description}")
+                lines.append(
+                    f"- **[{issue.severity}]** `{issue.file}:{issue.line}` - {issue.description}"
+                )
             lines.append("")
 
         # Other issues (limit display)
@@ -382,7 +415,9 @@ class PRAgent(BaseAgent):
             lines.append("### Review Findings")
             lines.append("")
             for issue in other_issues[:10]:
-                loc = f"`{issue.file}:{issue.line}`" if issue.line else f"`{issue.file}`"
+                loc = (
+                    f"`{issue.file}:{issue.line}`" if issue.line else f"`{issue.file}`"
+                )
                 lines.append(f"- **[{issue.severity}]** {loc} - {issue.description}")
             if len(other_issues) > 10:
                 lines.append(f"- ...and {len(other_issues) - 10} more issues")
@@ -406,8 +441,6 @@ class PRAgent(BaseAgent):
         review: PRReviewResult,
     ) -> list[str]:
         """Apply labels based on review result."""
-        labels_config = self.config.get("labels", {}).get("status", {})
-
         try:
             repo_labels = self.gitea.get_repo_labels(owner, repo)
             label_map = {l["name"]: l["id"] for l in repo_labels}
@@ -418,12 +451,15 @@ class PRAgent(BaseAgent):
         labels_to_add = []
 
         # Add approval/changes required label
+        # Use helper to support both old string and new dict format
         if review.approval:
-            label_name = labels_config.get("ai_approved", "ai-approved")
+            label_config = self._get_label_config("status", "ai_approved")
         else:
-            label_name = labels_config.get("ai_changes_required", "ai-changes-required")
+            label_config = self._get_label_config("status", "ai_changes_required")
 
-        if label_name in label_map:
+        label_name = label_config.get("name", "")
+
+        if label_name and label_name in label_map:
             labels_to_add.append(label_map[label_name])
 
         if labels_to_add: