CliBridge: drop redundant OUTPUT_PATTERN pre-check in runGitCmd

extractRequired already fails with a clear message when output is missing;
matches getCurrentSha/getBranches style (CodeRabbit review).

Co-authored-by: Ben Schellenberger <bschellenberger2600@users.noreply.github.com>

Author: cursoragent

testkit/java/src/main/java/io/gitfire/testkit/CliBridge.java

@@ -254,9 +254,6 @@ public String runGitCmd(String repoPath, String... args) {
     }
     payload.append("]}");
     String json = invoke(payload.toString());
-    if (!OUTPUT_PATTERN.matcher(json).find()) {
-      throw new IllegalStateException("missing output in bridge response: " + json);
-    }
     return extractRequired(json, OUTPUT_PATTERN, "output");
   }