Browser agent silently failed 17 form fields by validating its own input instead of form state

A browser automation agent designed to fill job application forms reported successful completion of 17 fields, yet none of the values were actually received by employers. The root cause was a flawed validation check that read back the agent's own typed text rather than confirming the value committed by the form widget. React-select comboboxes require a trusted mousedown event to open their option menus, but the agent used synthetic events, meaning no option was ever selected and hidden form values stayed empty. Because the readback falsely confirmed success, the agent never triggered a dedicated fallback path that would have correctly clicked and committed the options. The fix introduces three validation states — committed, uncommitted, and unknown — ensuring uncertain outcomes leave previous verdicts unchanged rather than producing false positives.