Agent: carmack
Add get_session() helper function that:
- Checks if webdriver is enabled
- Acquires the session read lock
- Returns the cloned session or an error message
Refactored 12 webdriver tool functions to use this helper:
- execute_webdriver_navigate
- execute_webdriver_get_url
- execute_webdriver_get_title
- execute_webdriver_find_element
- execute_webdriver_find_elements
- execute_webdriver_click
- execute_webdriver_send_keys
- execute_webdriver_execute_script
- execute_webdriver_get_page_source
- execute_webdriver_screenshot
- execute_webdriver_back
- execute_webdriver_forward
- execute_webdriver_refresh
Each function previously had ~10 lines of identical boilerplate.
Now reduced to 4 lines using the helper.
Net reduction: 68 lines (678 -> 610)
All tests pass. Behavior unchanged.
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