Every screen-targeted intent now routes through one
_require_current_screen() check and returns the structured error shape
instead of silently mutating an off-screen viewer (hoshe's finding:
scroll_rung from the reach screen fired real IPC and reported ok). The
reference driver's fixed 4-frame settle becomes is_pending()-aware with
a 600-frame bound, the keep-waiting decision extracted as a pure
testable function — restoring the proven eyeball-driver discipline. The
terrain_reference guard moves into AtlasApp._on_body_selected(), the
shared tail for double-click, Enter, AND the intent path — closing a
pre-existing click/Enter divergence hoshe caught this PR formalizing;
the intent layer pre-checks via the new SystemScreen.find_body() and
reports structured errors for unknown ids and terrain-less bodies.
after_test() resets AtlasAgentBridge.current_app (tyre's freed-pending
footgun). Suites 58/58 + 14/14; full suite 3,638.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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