The SAE perceive() had no structural fast-path for Instagram-internal
modal overlays (surveys, rating prompts, interstitials). These modals
live inside com.instagram.android and were invisible to the foreign-app
detector. The LLM fallback frequently misclassified them as NORMAL,
causing the bot to get trapped in survey dialogs.
Added two O(1) structural detection layers:
1. Resource-ID markers: survey_overlay_container, interstitial_container,
mystery_interstitial, nux_overlay, rating_prompt, feedback_dialog
2. Dismiss-button heuristic: cross-validates dismiss text with overlay
container structure to prevent caption false positives
Also removed dead code: xml_dump.lower() no-op.
Fixes: test_perceive_instagram_survey_modal
Zero regressions: 464 passed, 6 pre-existing failures
Marc Mintel
d298f03891