chore(license): re-license to dual MIT (core) + BSL 1.1 (stealth)

Squashed from chore/license-relicense. Full message preserved in the
original branch commit bb77eb5. See ADR-0002 for the decision rationale.

Refs: ADR-0002, commit bb77eb5

tasks.py

@@ -1,6 +1,12 @@
 """Pry — Background job system using asyncio (built-in) or Celery if available.
 Long-running jobs like crawls, monitors, and bulk imports should not block request threads."""
 
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2026 Rug Munch Media LLC
+#
+# Part of Pry — https://git.rugmunch.io/RugMunchMedia/pryscraper
+# Licensed under MIT. See LICENSE.
+
 import asyncio
 import json
 import logging