fix(cron): include token usage in cron job output (#490)

Cron job run_job() ran the agent but never extracted token
counts from the result dict. Usage data was accumulated by
the agent during the conversation, then discarded on return.

Fix: Add _format_token_usage() helper that extracts
input_tokens, output_tokens, total_tokens, api_calls, and
estimated_cost_usd from the agent result. Include a Token
Usage section in all three output templates (success,
script failure, sync fallback).

Closes #490

cron/scheduler.py

@@ -643,6 +643,27 @@ def _build_job_prompt(job: dict) -> str:
     return "\n".join(parts)
 
 
+def _format_token_usage(result: dict) -> str:
+    """Extract token usage from agent result dict for cron output display."""
+    inp = result.get("input_tokens", 0) or 0
+    out = result.get("output_tokens", 0) or 0
+    total = result.get("total_tokens", 0) or 0
+    cost = result.get("estimated_cost_usd")
+    calls = result.get("api_calls", 0) or 0
+
+    if inp == 0 and out == 0 and total == 0:
+        return ""  # No usage data available
+
+    lines = [f"- Input tokens: {inp:,}"]
+    lines.append(f"- Output tokens: {out:,}")
+    lines.append(f"- Total tokens: {total:,}")
+    lines.append(f"- API calls: {calls}")
+    if cost is not None:
+        lines.append(f"- Estimated cost: ${cost:.4f}")
+    return "\n".join(lines)
+
+
+
 def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
     """
     Execute a single cron job.
@@ -877,6 +898,8 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
             result = agent.run_conversation(prompt)
             final_response = result.get("final_response", "") or ""
             logged_response = final_response if final_response else "(No response generated)"
+            _token_usage = _format_token_usage(result)
+            _token_section = f"\n## Token Usage\n\n{_token_usage}\n" if _token_usage else ""
             output = f"""# Cron Job: {job_name}
 
 **Job ID:** {job_id}
@@ -890,7 +913,7 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
 ## Response
 
 {logged_response}
-"""
+{_token_section}"""
             logger.info("Job '%s' completed (sync fallback)", job_name)
             return True, output, final_response, None
 
@@ -969,6 +992,8 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
                 "Job '%s': agent reported script failure — %s",
                 job_name, _script_failed_reason,
             )
+            _token_usage = _format_token_usage(result)
+            _token_section = f"\n## Token Usage\n\n{_token_usage}\n" if _token_usage else ""
             output = f"""# Cron Job: {job_name} (SCRIPT FAILED)
 
 **Job ID:** {job_id}
@@ -982,9 +1007,11 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
 ## Response
 
 {logged_response}
-"""
+{_token_section}"""
             return False, output, final_response, _script_failed_reason
         
+        _token_usage = _format_token_usage(result)
+        _token_section = f"\n## Token Usage\n\n{_token_usage}\n" if _token_usage else ""
         output = f"""# Cron Job: {job_name}
 
 **Job ID:** {job_id}
@@ -998,7 +1025,7 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
 ## Response
 
 {logged_response}
-"""
+{_token_section}"""
         
         logger.info("Job '%s' completed successfully", job_name)
         return True, output, final_response, None