fix(compress): prefer persisted reference handoff after completion — v0.50.90 (PR #699 by @franksong2702)

Fixes the /compress reference card showing only a short 3-line summary immediately after compression. Now prefers the persisted compaction message (full handoff) over the raw API summary, matching what is shown after page reload. Closes #695.

tests/test_sprint46.py

@@ -155,3 +155,13 @@ def test_static_commands_js_registers_compress_alias(cleanup_test_sessions):
     assert "/api/session/compress" in src
     assert "cmdCompress" in src
     assert "cmdCompact" in src
+
+
+def test_static_commands_js_prefers_persisted_reference_message(cleanup_test_sessions):
+    from pathlib import Path
+
+    with open(Path(__file__).resolve().parents[1] / "static" / "commands.js", encoding="utf-8") as f:
+        src = f.read()
+
+    assert "const messageRef=referenceMsg?msgContent(referenceMsg)||String(referenceMsg.content||''):'';" in src
+    assert "const referenceText=messageRef || summaryRef;" in src