🤖 Limit git status output to reduce console spam

Two improvements to reduce noise from background git status operations:

1. **Limit SHOW_BRANCH output to 20 lines**
   - Git repos with long histories can have hundreds of commits
   - Now truncates to 20 lines with "... (N more commits omitted)" message
   - Prevents console from being flooded with commit history

2. **Increase bash truncate output from 50 to 80 lines**
   - 50 lines was too restrictive for useful debugging
   - 80 lines provides better context while still preventing spam
   - Only affects IPC bash calls (background operations)

These changes make git status polling less noisy while still providing
useful information for debugging.

_Generated with `cmux`_

Author: ammar-agent

src/services/tools/bash.test.ts

@@ -176,15 +176,15 @@ describe("bash tool", () => {
     if (!result.success) {
       // Should contain truncation notice
       expect(result.error).toContain("[OUTPUT TRUNCATED");
-      expect(result.error).toContain("Showing first 50 of");
+      expect(result.error).toContain("Showing first 80 of");
       expect(result.error).toContain("lines:");
 
-      // Should contain first 50 lines
+      // Should contain first 80 lines
       expect(result.error).toContain("line1");
-      expect(result.error).toContain("line50");
+      expect(result.error).toContain("line80");
 
-      // Should NOT contain line 51 or beyond
-      expect(result.error).not.toContain("line51");
+      // Should NOT contain line 81 or beyond
+      expect(result.error).not.toContain("line81");
       expect(result.error).not.toContain("line100");
 
       // Should NOT create temp file

src/services/tools/bash.ts

@@ -324,8 +324,8 @@ export const createBashTool: ToolFactory = (config: ToolConfiguration) => {
             const overflowPolicy = config.overflow_policy ?? "tmpfile";
 
             if (overflowPolicy === "truncate") {
-              // Return truncated output with first 50 lines
-              const maxTruncateLines = 50;
+              // Return truncated output with first 80 lines
+              const maxTruncateLines = 80;
               const truncatedLines = lines.slice(0, maxTruncateLines);
               const truncatedOutput = truncatedLines.join("\n");
               const errorMessage = `[OUTPUT TRUNCATED - ${overflowReason ?? "unknown reason"}]\n\nShowing first ${maxTruncateLines} of ${lines.length} lines:\n\n${truncatedOutput}`;