feat: retain live page mounts and update shared UI references across aliases

src/README.md

@@ -7,7 +7,8 @@
 | activity.rs | Bounded in-memory HTTP exchanges with marked previews and allowlisted request headers |
 | endor_host.rs | Aster compilation, fresh PUT candidates, worker-owned live REPL VM, bounded execution, root cleanup and AST developer tree |
 | endor_script.rs | Batch complete inputs for Aster's Interactive parser/compiler, retain Module entry, and rebase Aster spans to the original snapshot |
-| ui_bridge.rs | Tessera UI/page payloads and bound render methods, preallocated node/page pools and native snapshot extraction |
+| ui_bridge.rs | Tessera UI/page payloads and bound render methods, reusable node/page pools, explicit native-edge VM roots, live mounts/unmount and native frame extraction |
+| live_ui.rs | Stable native UI references, alias-preserving replacement, cycle/depth checks and immutable frame extraction |
 | layout.rs | Native UI tree to Frame; expanded-tree and coordinate budgets |
 | document.rs | Published source/AST/UI snapshot, revisions, invalidation, frame validation and display commands |
 | app.rs | Window events, redraw and system widget pointer/keyboard/IME routing |
@@ -30,9 +31,10 @@ to execute Endor in the application.
 A complete-PUT execution candidate owns all external VM roots, including the 4096-node pool
 and 64 pages with bound render callbacks. Script units share one globals dictionary
 inside the candidate; no variables or VM handles persist across successful PUTs.
-Callbacks return borrowed, preallocated real VM objects. Their mutable slots hold
-immutable native UI descriptions; child edges contain owned native Arcs, never
-managed VM references. Page rendering stores native root data in the build session;
+Callbacks return borrowed, preallocated real VM objects. UI payloads opt into Aster
+shared-reference assignment. Native live child/forward edges contain owned Arcs;
+Console registers corresponding external VM roots through retain/release, without
+mutable untraced VM edges in payloads. Window frames contain only immutable native data. Page rendering stores native root data in the build session;
 the final render selects the snapshot after all script units succeed. Once
 extraction finishes, release temporary results, clear
 globals, release roots, collect cycles and require an empty VM. The window keeps
@@ -65,10 +67,12 @@ typed actions and keep all execution/source behavior outside the widget layer.
 
 Console sessions use `endor_host::ReplSession` on the same worker thread. Real VM
 globals, UI pools and `_` survive between inputs. Parse/compile precede execution;
-only a successful input drains a render request and commits a native snapshot.
+only a successful input commits a pending mount or publishes changes to an existing mount.
 Runtime-failed input can retain earlier completed bindings, but cannot publish its
 pending render. Session budgets cover cumulative source/AST and fixed UI pools.
+page.unmount releases a mount; unused node/page pool slots are reclaimed between inputs.
 Explicit reset drops the VM; accepted PUT/code DELETE change the publication epoch
 and invalidate the old context. Source snapshots carry annotated AST ranges for the
 actual Console transcript; source history is never rerun to reconstruct memory.
-The Aster pin includes independent Assignment AST/name-analysis/bytecode support.
+The Aster pin includes independent Assignment syntax and generic opt-in assign_from support.
+Live reference tests cover alias updates, nested mounts, cycle rejection, detached branch release and unmount/remount.