fix: make RPM jitter exemption side-aware with one-shot room

Verifier adversarial cases showed pooled-room exemption could hide real
breaches: edge rows may only borrow from the neighbor on their own side,
and neighbor room is consumed globally so two windows cannot claim the
same slot. Also parse SQLite created_at as UTC, guard the dispatch
semaphore on progress-callback failure, and print a caveat that rescore
live checks reflect current db3 state.

tools/soak/run_soak.py

@@ -87,7 +87,9 @@ def _rss_mb() -> float:
     return int(out.stdout.strip()) / 1024.0
 
 
-async def _paced_dispatch(generator, *, sem, spawn, should_stop, on_dispatched) -> set[asyncio.Task]:
+async def _paced_dispatch(
+    generator, *, sem, spawn, should_stop, on_dispatched
+) -> set[asyncio.Task]:
     """有界分发: 先占并发名额再建任务,名额由任务收尾释放。
 
     2026-07-21 P6 教训: 无界 create_task 曾在 15s 内入队全部预算,
@@ -105,8 +107,12 @@ async def _paced_dispatch(generator, *, sem, spawn, should_stop, on_dispatched)
         if should_stop():
             break
         await sem.acquire()
-        on_dispatched()
-        task = asyncio.create_task(_run(spawn(kind, kwargs)))
+        try:
+            on_dispatched()
+            task = asyncio.create_task(_run(spawn(kind, kwargs)))
+        except BaseException:
+            sem.release()  # 名额已占而任务未建(如进度采样失败),不泄漏
+            raise
         inflight.add(task)
         task.add_done_callback(inflight.discard)
     return inflight
@@ -336,6 +342,9 @@ def main() -> None:
             raise SystemExit(f"拒跑: 找不到 data/soak/result_{args.run_id}_*.json")
         args.workers = len(found)
         _guard(env, args.workers, args.scope)
+        print(
+            "rescore: 记账归零/gate 两项活检查反映**当前** db3 状态;若 db3 已被后续 run 复用请忽略"
+        )
         _scoreboard(args, env)
         return
     if args.budget_calls is None or args.budget_tokens is None: