fix(provision): stabilize kimi a7m import closure

Downgrade the first third-party account test 403 to an advisory warning when models are already present, and retry transient gateway completion 503 responses during access closure.

Add regression coverage for the probe race and completion retry paths, update the execution board, and store the final v0.1.129 Kimi A7M fresh-host acceptance artifact that now reaches succeeded/active/subscription_ready.

docs/EXECUTION_BOARD.md

@@ -11,6 +11,7 @@
 - `subscription` 主链路已通过 latest fresh-host 复验：
   - MiniMax 53hk：`artifacts/real-host-acceptance/20260521_191418_remote43_minimax_key_import/21-summary.json`
   - DeepSeek 2166：`artifacts/real-host-acceptance/20260521_201509_remote43_deepseek_key_import/21-summary.json`
+  - Kimi A7M（local host `v0.1.129`）：`artifacts/real-host-acceptance/20260522_122706_local_v0129_kimi_a7m_subscription_freshhost/21-summary.json`
 - `self_service` 主链路已通过 latest-head 标准 fresh-host 复验：
   - `artifacts/real-host-acceptance/20260521_210403/05-import.json`
   - `artifacts/real-host-acceptance/20260521_210403/07-access-status.json`
@@ -64,6 +65,10 @@
    - 主目录 `artifacts/real-host-acceptance/` 当前只保留最终证据
    - 历史失败/半成功/试错样本已迁到 `artifacts/real-host-acceptance-archive/`
    - 分类规则见：`docs/REAL_HOST_ARTIFACT_RETENTION.md`
+13. relay-manager latest-head 已收口 Kimi A7M 两段竞态
+   - account test 首次 `403 Forbidden` 已降级为 advisory warning；只要 `/models` 已命中 `smoke_test_model`，不会再把 batch 误判为 blocking failure
+   - access closure 对导入后瞬时 `503 / no available accounts` 增加短暂 completion retry，避免宿主异步 probe / account warm-up 窗口把真实可用链路误记成 `broken`
+   - `20260522_122706_local_v0129_kimi_a7m_subscription_freshhost` 已证明：在修复后的 relay-manager + patched host 组合下，`kimi-a7m / kimi-k2.6` 可落到 `batch_status=succeeded`、`provider_status=active`、`latest_access_status=subscription_ready`
 
 ## 已验证门禁
 
@@ -106,6 +111,11 @@
    - official MiniMax 模板 live 样本
    - 模板链路打通，但当前验证 key 命中 upstream `429`
 
+7. `artifacts/real-host-acceptance/20260522_122706_local_v0129_kimi_a7m_subscription_freshhost`
+   - latest-head relay-manager 对 patched host `v0.1.129` 的 Kimi A7M `subscription` 最终成功样本
+   - `21-summary.json` 已到 `batch_status=succeeded`、`provider_status=active`
+   - `account_probe_summary` 明确记录 `probe_advisory=true`、`validation_status=warning`，证明 403 probe race 已被 relay-manager 正确降级
+
 ## 剩余项（P2 / 运营前置，不阻塞按 PRD 首版范围上线）
 
 1. 运营前置