@opentui/keymap@0.3.2 was installed but unused (the spec said we'd use it). Wire
it natively: createDefaultOpenTuiKeymap(renderer) + <KeymapProvider> at the render
root, and a useCloseLayer(target,onClose) helper that registers a focus-within
Esc/Ctrl+C → close layer. Migrated the close handling of sessionSwitcher, picker,
approvalPrompt (close-only), confirmPrompt (y/n via confirm/cancel commands), and
pager + agentsDashboard (close via keymap; scroll/select stay raw — not cleanly
focus-gated). Overlays gain a root ref + focus-on-mount so the focus-within layer
activates. q-close re-added to pager/dashboard (footer advertises it).
Composer history/refocus + masked prompt + the Ctrl+C quit machine stay raw by
design (need the in-flight keystroke / careful state). Test harness gains a
withKeymap() wrapper so view tests mount under a provider. 91 pass; live-verified
/sessions + /tools Esc-close and composer focus recovery after.
alt-glitch
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