feat: add interactive VT and workspace command plane

docs/TESTING.md

@@ -111,9 +111,16 @@ who already have the final cargo-watch release installed.
   dimensions, and exclusion of provider credentials from the child environment.
 - `lumbridge-runtime` tests ordered actor output, serialized input and resize,
   event polling, invalid configuration, and bounded-time cleanup of a hung PTY.
-- The GPUI slice tests byte line-framing across CRLF, chunk boundaries, split
-  UTF-8, and invalid bytes. It renders one real actor-owned PTY and keeps five
-  surfaces deterministic; line framing is explicitly not VT emulation.
+  A cross-crate integration test drives a real synthetic shell through actor
+  output, VT parsing, terminal key encoding, and a 41×101 resize.
+- `lumbridge-terminal` fixtures cover styled Unicode, cursor/title state,
+  alternate screen, bracketed paste, protocol replies, sanitized title and
+  blocked OSC 52 behavior, key encoding, application-cursor mode, and resize.
+- `lumbridge-core` tests capability-gated split/select/rename/close commands,
+  idempotent request IDs, close-tree promotion, and atomic agentic setup plans.
+- The GPUI slice tests its key-event adapter. It renders one real actor-owned VT
+  session as plain snapshot rows and keeps five surfaces deterministic; styled
+  cell/cursor rendering remains a separate gate.
 - The current-GPUI probe compile-checks real AccessKit element wiring and real
   platform input-handler installation. Unit tests cover its semantic tree and
   UTF-16/UTF-8 composed-text mutations. OS screen readers, IME candidate windows,