fix(MAT-273): remove Skyvern (archived) + fix CI test failures

- Remove Skyvern service + DB from docker-compose.yml
- Remove cron/browser_executor.py and pipelines/steps/skyvern.py
- Remove browser_scrape from cron executor dispatch
- Update tests to reflect Skyvern removal
- Fix test_needs_query_rewrite false positive ('das' is a valid trigger)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pipelines/steps/__init__.py

@@ -6,7 +6,6 @@ from .script import execute_script
 from .claude_prompt import execute_claude_prompt
 from .template import execute_template
 from .api_call import execute_api_call
-from .skyvern import execute_skyvern
 from .pitrader_step import execute_pitrader
 
 logger = logging.getLogger(__name__)
@@ -16,7 +15,6 @@ STEP_EXECUTORS = {
     "claude_prompt": execute_claude_prompt,
     "template": execute_template,
     "api_call": execute_api_call,
-    "skyvern": execute_skyvern,
     "pitrader_script": execute_pitrader,
 }