Merge pull request #28 from Snowflake-Labs/fix/prompt-filter-python39-compat

Fix prompt_filter.py crash on Python < 3.10 (macOS)

Author: sfc-gh-uunnikrishnan

plugins/cortex-code/scripts/router/prompt_filter.py

@@ -5,6 +5,7 @@
 and if matched, prints a routing instruction to stdout that gets injected
 into the conversation context. Runs in <50ms -- no LLM calls, no network.
 """
+from __future__ import annotations
 
 import sys
 import re