🤖 Store rawCommand in metadata & remove CompactionBarrier

Changes:
- Renamed 'command' to 'rawCommand' in CmuxFrontendMetadata
  - Clarifies this is the user's exact input for faithful display
- Removed CompactionBarrier component
  - StreamingBarrier now handles both streaming and compaction
  - Reduces code duplication (37 lines removed)
- Updated all references to use rawCommand:
  - prepareCompactionMessage() in ChatInput
  - StreamingMessageAggregator display logic
  - useAutoCompactContinue edit detection
  - Integration test

Benefits:
- More semantic field name (rawCommand vs command)
- Single barrier component for both streaming states
- No functional changes - all tests pass

Author: ammar-agent

src/components/ChatInput.tsx

@@ -307,7 +307,7 @@ function prepareCompactionMessage(
 
   const metadata: CmuxFrontendMetadata = {
     type: "compaction-request",
-    command,
+    rawCommand: command,
     parsed: {
       maxOutputTokens: parsed.maxOutputTokens,
       continueMessage: parsed.continueMessage,

src/components/Messages/ChatBarrier/CompactionBarrier.tsx

@@ -73,7 +73,7 @@ export function useAutoCompactContinue() {
             .map((p) => p.text)
             .join("");
 
-          if (currentContent !== cmuxMeta.command) {
+          if (currentContent !== cmuxMeta.rawCommand) {
             // Message was edited - re-parse
             const parsed = parseCommand(currentContent);
             continueMessage = parsed?.type === "compact" ? parsed.continueMessage : undefined;

src/hooks/useAutoCompactContinue.ts

@@ -8,7 +8,7 @@ import type { ToolPolicy } from "@/utils/tools/toolPolicy";
 export type CmuxFrontendMetadata =
   | {
       type: "compaction-request";
-      command: string; // The original /compact command for display
+      rawCommand: string; // The original /compact command as typed by user (for display)
       parsed: {
         maxOutputTokens?: number;
         continueMessage?: string;
@@ -89,7 +89,7 @@ export type DisplayedMessage =
       timestamp?: number;
       compactionRequest?: {
         // Present if this is a /compact command
-        command: string;
+        rawCommand: string;
         parsed: {
           maxOutputTokens?: number;
           continueMessage?: string;