Tyre's finding: _on_hud_app_changed ran open_app synchronously from
INSIDE close_app's app_changed emit; close_app continues past the emit
and resets _active_app, clobbering the re-open — Atlas left visible
(z already raised) but is_app_active() false, so atlas_app's input
guard rejects every key: keyboard soft-lock after one M/Escape on the
reach screen. Fix: open_app.call_deferred, out of the signal frame.
Two regression tests pin the contract at the HudGroups level (no
server needed): the synchronous shape must keep getting clobbered and
the deferred shape must survive — if HudGroups emit semantics ever
change, both flag the contract shift for a deliberate look.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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