feat: migrate agent core to pydantic-ai framework

core/schemas.py

@@ -0,0 +1,36 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+
+
+class NotificationDecision(BaseModel):
+    """Structured decision returned by NotificationReaderAgent."""
+    action: str = Field(..., description="Action to take: 'PROCESS_ISSUE', 'PROCESS_PR', or 'SKIP'")
+    owner: str = Field(default="", description="Repository owner")
+    repo: str = Field(default="", description="Repository name")
+    number: int = Field(default=0, description="Issue or PR number")
+    reason: str = Field(..., description="Reason for the routing decision")
+
+
+class CoordinatorDecision(BaseModel):
+    """Structured decision returned by CoordinatorAgent."""
+    action: str = Field(..., description="Action to take: 'PROPOSE_PLAN', 'EXECUTE_PLAN', 'ANSWER_QUESTION', 'CLOSE_ISSUE', 'NO_ACTION'")
+    issue_number: int = Field(default=0, description="Issue number")
+    plan: Optional[str] = Field(default=None, description="Proposed or approved implementation plan")
+    answer: Optional[str] = Field(default=None, description="Answer to question")
+    comment: Optional[str] = Field(default=None, description="Closing comment")
+
+
+class ExecutionPlan(BaseModel):
+    """Structured implementation plan generated by PlanningAgent."""
+    issue_number: int = Field(..., description="Target issue number")
+    title: str = Field(..., description="Plan title")
+    steps: list[str] = Field(default_factory=list, description="Step-by-step implementation tasks")
+    summary: str = Field(default="", description="Summary of proposed changes")
+
+
+class CodingTaskResult(BaseModel):
+    """Structured execution result returned by CodingAgent."""
+    status: str = Field(..., description="Execution status: 'SUCCESS', 'FAILED', or 'PARTIAL'")
+    summary: str = Field(default="", description="Summary of completed coding work")
+    modified_files: list[str] = Field(default_factory=list, description="List of modified or created files")
+    error_message: Optional[str] = Field(default=None, description="Error message if execution failed")