fix: retain completed results during live editing

README.md

@@ -8,9 +8,9 @@ Patterns, replacement templates, test text and project files stay in the
 browser. There is no account, backend, upload, remote execution, telemetry,
 runtime CDN, remote font, or cloud-save service.
 
-## Current release — 0.4.0
+## Current release — 0.4.1
 
-The v0.4.0 release contains twelve selectable, executable profiles:
+The v0.4.1 release contains twelve selectable, executable profiles:
 
 - **JavaScript (ECMAScript)** — the current browser's native `RegExp`, with
   ECMAScript 2025 syntax supplied by regexpp 4.12.2;
@@ -99,6 +99,9 @@ relabeled Scala engine.
 - Parsing and execution run in separate workers.
 - Actual execution can be terminated by killing its worker.
 - The worker is recreated after timeout, crash or cancellation.
+- Live editing retains the last completed, input-bound syntax and result frame
+  until the newest revision finishes. Stale frames are labelled and cannot
+  enable Run, decorate current editors, or drive current-input selections.
 - ECMAScript capture ranges use the engine's `d` indices result; every other
   profile returns its native range records through a bounded fixed bridge.
 - Named, numbered, optional, empty and repeated-final captures are represented.