fix: second-audit gate findings (B1, I1-I8, M1-M10)

B1: gateway capability check now triggers on walking the sub2api
gateway, not on the gateway having filled a model; task-level
explicit models are audited (worker_capability_gateway_explicit)
but never blocked, preserving explicit priority; gateway-default
models still fail-fast under active.
I1: dry-run adds a gateway-model section, sourced only from
CLOUD_SUB2API_DEFAULT_MODEL (never queries the relay); an active
tier whose requires the gateway model fails or cannot verify
blocks, shadow only warns.
I2: shadow review gate now counts completed samples
(completed >= 20), same basis for sample_shortfall; the endpoint
attaches per-tier capability status (read-only policy load) and
flags capability-failing tiers in the recommendation.
I3: configured-but-broken routing policy logs a warning in
load_routing_policy (unconfigured stays silent); the worker sets
routing_policy_load_failed and audits
worker_routing_policy_load_failed per task.
I4: resume preamble wraps prior output/error as data with an
explicit do-not-execute constraint; position verified in run_one
(tree -> preamble -> project -> original) and the docs corrected
from the false 'closest to the original prompt' claim.
I5: decided model is written back with a CAS UPDATE
(model IS NULL OR model=''), so later attempts reuse it;
explicit models are never overwritten.
I6: agent_* columns added to worker._ensure_result_columns and
db.init_postgres_schema backfill; migrations backfills them for
tasks before insert (sender_task_id pattern); column-level tests
for agent_tool_approvals and task_attempts.
I7: coordinator requeue adds AND status=<snapshot> (rowcount 0
skips requeue/audit) and filters paused_by_user / user_cancel /
user_pause children, which are never revived or cleared.
I8: explicit-model tasks (including coordinator children that
inherited a parent model) audit a source=explicit worker_routing
row; evaluate_shadow counts it as per-tier explicit_n only,
never routed_n, never a dedup slot.
M1/M2/M3/M5/M6/M8/M10: dedup slot moved after tier validation,
shadow sort doc fixed, truncated recommendation notes truncation,
seed cleanup on gateway/quota/goal-cap early returns, tools-only
coordinator definitions rejected, preamble goal branch marked
effectively unreachable, DESIGN.md drift corrected (outside repo).
M4/M7/M9: documentation/new-field only (pass_rate_fully_measured,
whitespace-model shadow-drop note, bound-note race note); old
field semantics unchanged.

cloud/eval_loop.py

@@ -230,11 +230,22 @@ def _run_stats(scored):
                        if s["score"] is not None]
     mean_score = (sum(measured_scores) / len(measured_scores)) \
         if measured_scores else None
+    # Audit fix 3（M4，新增字段、旧字段语义不动）：
+    # pass_rate 含未完全测定任务（all_pass 在含 unknown
+    # 检查时仍可为真），只看它会被误导；严格口径是
+    # pass_rate_fully_measured：分母只含 fully_measured
+    # 任务。旧 pass_rate 保留原口径，不改，避免已有机
+    # 制的对比口径悄悄变。
+    fully_n = sum(1 for s in scores if s["fully_measured"])
+    fully_pass = sum(1 for s in scores
+                     if s["fully_measured"] and s["all_pass"])
     return {
         "n": n, "pass_rate": (passed_tasks / n) if n else None,
         "passed_tasks": passed_tasks, "mean_score": mean_score,
-        "fully_measured_n": sum(1 for s in scores
-                                if s["fully_measured"]),
+        "fully_measured_n": fully_n,
+        "fully_measured_passed_tasks": fully_pass,
+        "pass_rate_fully_measured": (fully_pass / fully_n)
+        if fully_n else None,
         "unknown_tasks_n": sum(1 for s in scores if s["unknown"]),
         "unmatched_n": len(scored["unmatched"]),
     }