Two root causes for 'scroll on story' bug:
1. ScreenIdentity had ZERO structural markers for story views.
reel_viewer_media_layout, reel_viewer_header, reel_viewer_progress_bar
and content-desc 'Like Story'/'Send story' now → STORY_VIEW.
2. Brain prompt was prescriptive ('you MUST scroll down'), overriding
the LLM's intelligence. Rewritten to give context about screen types
and let the AI reason autonomously about which action makes sense.
Philosophy: AI decides navigation, we provide correct perception data.
No hardcoded 'if story → press back' escape hatch.
4 new perception tests (all green), 0 regressions.
Marc Mintel
1e1bba6b16