umputun / agterm / 30724758716

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feat: add pane-scoped overlays (#343)

* feat(core): add the pane-overlay model, store lifecycle and teardown

OverlayPane / PaneOverlay plus the paired left and right Session slots with
their surfaces and exit codes, the store's open / close / exit-record with
typed rejections, and freeing both slots at every overlay teardown site,
including migrating the right overlay on pane promotion.

* feat(control): add --pane to the overlay control commands

* feat(cli): add --pane to the agtermctl overlay commands

* feat(app): render pane-scoped overlays inside each split pane

* feat(app): make focus, search and covers pane-overlay aware

* feat(zoom): make pane overlays zoomable as their own surfaces

* test(ui): cover pane overlays in hosted UI tests

Both panes open at once and close independently, the hidden-split rejection,
the Cmd-W rung, the zoom round-trip, and the acceptance-criteria pass that
closed the auto-close-on-exit, --wait and overlay.result --pane gaps.

* docs: document pane-scoped overlays across the synchronized surfaces

README, the bundled skill, site/commands.html and site/docs.html gain --pane,
the paneOverlays read-back and the overlay-left / overlay-right surface ids;
.claude/rules/libghostty.md pins the arranged-subview and detail-deck
constraints the per-pane chrome relies on.

* fix: address code review findings

* refactor: address code smell findings

* fix(core): retire pane-overlay slots whose terminal never started

A slot could stay marked open with no process behind it, so overlay result
answered "overlay still running" forever and --block never returned. The slot
is now retired when its pane stops being laid out and its terminal was never
created, keyed on the new TerminalSurface.isRealized rather than view-slot
occupancy, sparing a slot terminal zoom is hosting, and re-run when an undone
close or workspace restore reinserts a live session.

* docs: move completed plan 20260801-pane-scoped-overlays.md to completed/

* d... (continued)

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