fix(d2p): remove dangling logger.info refs in seeded_router

E4-v4 forensic: 1235/1285 requests failed with
  NameError: name 'logger' is not defined

When commit b9b0cf0 added agentic-side D→P orchestration, the
post-call diagnostic was written as logger.info(...). But
src/agentic_pd_hybrid/replay.py doesn't import the logging
module nor define a module-level `logger`. v3 didn't hit it
because config.enable_d_to_p_sync was always False
(plumbing bug fixed in af966f2). v4 with sync enabled tripped
the NameError on EVERY reseed-path request → 96% failure rate.

Fix is to remove the redundant logger.info — the structural log
(`structural/d-to-p-sync.jsonl`, added in e729d62) already
captures every prepare/dump/finalize decision.

src/agentic_pd_hybrid/replay.py

@@ -2356,19 +2356,10 @@ async def _invoke_kvcache_seeded_router(
             prefill_url=prefill_url,
             decode_session=decode_session,
         )
-        if sync_result is not None and sync_result.get("status") != "ok":
-            logger.info(
-                "d_to_p_sync sid=%s rid=%s skipped: %s",
-                request.session_id, request.request_id, sync_result,
-            )
-        elif sync_result and sync_result.get("status") == "ok":
-            logger.info(
-                "d_to_p_sync sid=%s rid=%s pushed=%d ingested_prefix=%d",
-                request.session_id,
-                request.request_id,
-                sync_result.get("bytes_pushed", 0),
-                sync_result.get("inserted_prefix_len", 0),
-            )
+        # NB: every outcome of _attempt_d_to_p_sync is already captured in
+        # structural/d-to-p-sync.jsonl via _structural_emit. No need for an
+        # additional logger.info here (and `logger` isn't imported at module
+        # scope, so it would NameError if reached).
 
     decode_session_newly_opened = False
     try: