fix(cron): pass skip_context_files=True to AIAgent in run_job (#7958)

Cron jobs run from whatever directory the scheduler process lives in
(typically the hermes-agent install dir), so without this flag the agent
picks up AGENTS.md, SOUL.md, or .cursorrules from that cwd — injecting
irrelevant project context into the cron job's system prompt.

batch_runner.py and gateway boot_md already pass skip_context_files=True
for the same reason. This aligns cron with the established pattern for
autonomous/headless agent runs.

cron/scheduler.py

@@ -722,6 +722,7 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
             provider_sort=pr.get("sort"),
             disabled_toolsets=["cronjob", "messaging", "clarify"],
             quiet_mode=True,
+            skip_context_files=True,  # Don't inject SOUL.md/AGENTS.md from scheduler cwd
             skip_memory=True,  # Cron system prompts would corrupt user representations
             platform="cron",
             session_id=_cron_session_id,