fix(409): the report check's prefilter no longer depends on compact JSON (#4014)

CI run #517 failed five of the new hook tests, all of them expecting a
request that never went out. The prefilter matched `"name":"…update_task"`
with no space after the colon, which is how Claude Code writes its
transcripts, while the tests wrote theirs with json.dumps defaults
(`"name": "…"`). The hook exited at the prefilter for every test transcript.
The silent-case tests passed for the same wrong reason.

- The prefilter now allows whitespace after the colon. The jq parse behind it
  never depended on formatting.
- The test transcripts are written compact, matching the real file. The
  silent-case tests now reach the turn parse rather than stopping at the
  prefilter.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/test_report_check_hook.py

@@ -55,7 +55,8 @@ def _text(text):
 
 def _transcript(tmp_path, lines):
     path = tmp_path / "t.jsonl"
-    path.write_text("\n".join(json.dumps(line) for line in lines) + "\n")
+    # Compact, like the file Claude Code writes ({"name":"…"}, no spaces).
+    path.write_text("\n".join(json.dumps(line, separators=(",", ":")) for line in lines) + "\n")
     return path