Add structured step logging and error reporting

src/agentci/workflows/dispatcher.py

@@ -1,11 +1,15 @@
 from __future__ import annotations
 
+import logging
+
 from agentci.domain.models import Job, JobKind
 from agentci.workflows.common import Dependencies
 from agentci.workflows.implement import ImplementWorkflow
 from agentci.workflows.plan import PlanWorkflow
 from agentci.workflows.pull_request import PullRequestWorkflow
 
+log = logging.getLogger(__name__)
+
 
 class Dispatcher:
     def __init__(self, dependencies: Dependencies) -> None:
@@ -21,5 +25,16 @@ class Dispatcher:
         }
 
     async def dispatch(self, job: Job) -> None:
-        await self.handlers[job.kind](job)
-
+        extra = {
+            "operation": "workflow.dispatch",
+            "job_id": job.id,
+            "target": job.target_key,
+            "stage": job.kind.value,
+        }
+        log.info("workflow dispatch started", extra=extra)
+        try:
+            await self.handlers[job.kind](job)
+        except Exception:
+            log.exception("workflow dispatch failed", extra=extra)
+            raise
+        log.info("workflow dispatch completed", extra=extra)