CB-563: mark clipped completion scrapes

bridged/src/main/java/dev/ltms/bridged/inject/CompletionResolver.java

@@ -55,6 +55,9 @@ public final class CompletionResolver implements TurnListener {
     /** Cap the scraped tail so a long transcript can't return an unbounded blob. */
     static final int MAX_SCRAPE_CHARS = 4000;
 
+    private static final String CLIPPED_PANE_TAIL_MARKER =
+            "[Pane tail clipped: member did not call bridge_reply.]";
+
     private final AgentControl agents;
     private final Rendezvous rendezvous;
 
@@ -147,9 +150,14 @@ public final class CompletionResolver implements TurnListener {
             return;
         }
         String tail;
+        int originalLength = 0;
+        boolean clipped = false;
         boolean scrapeFailed = false;
         try {
-            tail = clip(lastAssistantBlock(agents.read(target, SCRAPE_SOURCE)));
+            String assistantBlock = lastAssistantBlock(agents.read(target, SCRAPE_SOURCE));
+            originalLength = assistantBlock.strip().length();
+            clipped = originalLength > MAX_SCRAPE_CHARS;
+            tail = clip(assistantBlock);
         } catch (RuntimeException e) {
             // The worker finished but we couldn't read its screen — still resolve the send so the
             // caller unblocks; an empty tail beats hanging until the caller's timeout.
@@ -169,8 +177,14 @@ public final class CompletionResolver implements TurnListener {
                     target);
             return; // keep the in-flight record: a later genuine completion still needs it
         }
-        if (rendezvous.resolveCompletion(waiter, tail)) {
+        String completion = clipped ? tail + "\n" + CLIPPED_PANE_TAIL_MARKER : tail;
+        if (rendezvous.resolveCompletion(waiter, completion)) {
             inFlight.remove(target, turn);
+            if (clipped) {
+                log.warn("completion scrape for {} clipped from {} chars to the {} char cap; "
+                                + "member did not call bridge_reply, so the pane tail is partial",
+                        target, originalLength, MAX_SCRAPE_CHARS);
+            }
             log.debug("resolved send to {} via turn-completion fallback ({} chars scraped)",
                     target, tail.length());
         }