fix: address M3 verifier findings on soak invariants and probe tests

tools/soak/run_soak.py

@@ -139,6 +139,8 @@ async def _worker_async(args: argparse.Namespace, worker_idx: int) -> None:
         telemetry_db=_ROOT / "data/soak/generate_questions_telemetry.db",
         frames_root=_ROOT / "data/soak/vt_frames",
         images_root=_ROOT / "data/soak/chs_images",
+        # P7 只需 images: chains/replays 的 base64 负载曾把起跑 RSS 顶到 ~690MB(verifier I1)
+        modalities=("images",) if args.scenario == "P7" else ("chains", "replays", "images"),
     )
     generator = SCENARIOS[args.scenario](corpus, f"{run_id}-w{worker_idx}")
     sem = asyncio.Semaphore(args.concurrency)
@@ -297,6 +299,8 @@ def _p7_checks(args, env, results, rows, calls, verdicts, check) -> None:
     check("坏源尝试占比 ≤15%(P7)", sb.inv_fault_share, rows, fault_names, max_share=0.15)
     check("故障混编生效(P7)", sb.inv_fault_errors_present, rows, fault_source_names=fault_names)
     check("错误全部可分类(P7)", sb.inv_errors_classified, rows, _KNOWN_ERROR_PREFIXES)
+    for r in results:
+        check("RSS 绝对值 <500MB(P7)", sb.inv_rss_absolute, r["rss_current_mb"], max_mb=500.0)
     cancelled = sum(r["stats"]["cancelled"] for r in results)
     verdicts.append(
         ("零取消泄漏(P7)", "PASS" if cancelled == 0 else f"FAIL — cancelled={cancelled}")
@@ -388,11 +392,18 @@ async def _live_checks(
         lease_ttl_s=settings.lease_ttl_s,
     )
     gate = RedisGate.from_url(env["REDIS_URL"], config=settings.breaker, scope=settings.scope)
+    checks = [
+        ("记账归零(inflight)", sb.inv_accounting_zeroed(limiter, names)),
+        ("gate 可再准入(探针不悬挂)", sb.inv_gate_reenterable(gate, names)),
+    ]
+    if args.scenario == "P7":
+        fault = {
+            s.strip() for s in env.get(f"{args.scope}_FAULT_SOURCES", "").split(",") if s.strip()
+        }
+        healthy = [n for n in names if n not in fault]
+        checks.append(("真源门态 CLOSED(P7 零误熔)", sb.inv_healthy_gates_closed(gate, healthy)))
     try:
-        for name, invariant in (
-            ("记账归零(inflight)", sb.inv_accounting_zeroed(limiter, names)),
-            ("gate 可再准入(探针不悬挂)", sb.inv_gate_reenterable(gate, names)),
-        ):
+        for name, invariant in checks:
             try:
                 await invariant
                 verdicts.append((name, "PASS"))