feat(MAT-174): Add cron job scheduler and executors

Cron package that syncs jobs from matrixhost portal API, schedules execution
with timezone-aware timing, and posts results to Matrix rooms. Includes
Brave Search, reminder, and browser scrape (placeholder) executors with
formatter. 31 pytest tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cron/browser_executor.py

@@ -0,0 +1,43 @@
+"""Browser scrape executor for cron jobs (placeholder for workflow-use integration)."""
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+async def execute_browser_scrape(job: dict, send_text, **_kwargs) -> dict:
+    """Execute a browser-based scraping job.
+
+    This is a placeholder that will be fully implemented when workflow-use
+    or Skyvern is deployed. For now, it posts a message indicating the
+    feature is pending setup.
+    """
+    target_room = job["targetRoom"]
+    config = job.get("config", {})
+    url = config.get("url", "")
+    browser_profile = job.get("browserProfile")
+
+    if not browser_profile:
+        await send_text(
+            target_room,
+            f"**{job['name']}**: Browser scan requires a connected browser profile. "
+            f"Set one up at https://matrixhost.eu/settings/automations",
+        )
+        return {"status": "error", "error": "No browser profile configured"}
+
+    if browser_profile.get("status") == "expired":
+        await send_text(
+            target_room,
+            f"**{job['name']}**: Your browser session has expired. "
+            f"Please re-record at https://matrixhost.eu/settings/automations",
+        )
+        return {"status": "error", "error": "Browser session expired"}
+
+    # TODO: Integrate workflow-use or Skyvern for actual browser replay
+    # For now, fall back to a simple notification
+    await send_text(
+        target_room,
+        f"**{job['name']}**: Browser scan for {url} is configured but browser "
+        f"replay is not yet available. Web Search automations work now.",
+    )
+    return {"status": "error", "error": "Browser executor not yet implemented"}