feat(cron): add script field for pre-run data collection (#5082)

Add an optional 'script' parameter to cron jobs that references a Python
script. The script runs before each agent turn, and its stdout is injected
into the prompt as context. This enables stateful monitoring — the script
handles data collection and change detection, the LLM analyzes and reports.

- cron/jobs.py: add script field to create_job(), stored in job dict
- cron/scheduler.py: add _run_job_script() executor with timeout handling,
  inject script output/errors into _build_job_prompt()
- tools/cronjob_tools.py: add script to tool schema, create/update handlers,
  _format_job display
- hermes_cli/cron.py: add --script to create/edit, display in list/edit output
- hermes_cli/main.py: add --script argparse for cron create/edit subcommands
- tests/cron/test_cron_script.py: 20 tests covering job CRUD, script
  execution, path resolution, error handling, prompt injection, tool API

Script paths can be absolute or relative (resolved against ~/.hermes/scripts/).
Scripts run with a 120s timeout. Failures are injected as error context so
the LLM can report the problem. Empty string clears an attached script.

hermes_cli/cron.py

@@ -90,6 +90,9 @@ def cron_list(show_all: bool = False):
         print(f"    Deliver:   {deliver_str}")
         if skills:
             print(f"    Skills:    {', '.join(skills)}")
+        script = job.get("script")
+        if script:
+            print(f"    Script:    {script}")
         print()
 
     from hermes_cli.gateway import find_gateway_pids
@@ -149,6 +152,7 @@ def cron_create(args):
         repeat=getattr(args, "repeat", None),
         skill=getattr(args, "skill", None),
         skills=_normalize_skills(getattr(args, "skill", None), getattr(args, "skills", None)),
+        script=getattr(args, "script", None),
     )
     if not result.get("success"):
         print(color(f"Failed to create job: {result.get('error', 'unknown error')}", Colors.RED))
@@ -158,6 +162,9 @@ def cron_create(args):
     print(f"  Schedule: {result['schedule']}")
     if result.get("skills"):
         print(f"  Skills: {', '.join(result['skills'])}")
+    job_data = result.get("job", {})
+    if job_data.get("script"):
+        print(f"  Script: {job_data['script']}")
     print(f"  Next run: {result['next_run_at']}")
     return 0
 
@@ -195,6 +202,7 @@ def cron_edit(args):
         deliver=getattr(args, "deliver", None),
         repeat=getattr(args, "repeat", None),
         skills=final_skills,
+        script=getattr(args, "script", None),
     )
     if not result.get("success"):
         print(color(f"Failed to update job: {result.get('error', 'unknown error')}", Colors.RED))
@@ -208,6 +216,8 @@ def cron_edit(args):
         print(f"  Skills: {', '.join(updated['skills'])}")
     else:
         print("  Skills: none")
+    if updated.get("script"):
+        print(f"  Script: {updated['script']}")
     return 0