docs: apply hierarchy across the corpus

packages/acp/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/acp/README.md
-README.md: 326615210e5cfc39004fc5ab7462623089ac4126
-README.zh.md: 8679f2428a9e82a81de69d7d1413132a946fcafa
+README.md: 3ba247598f29f2244456061fe7f9a3282086148f
+README.zh.md: c13bc05b12fff2ef97b4d547936aa14a6556430a

packages/acp/README.md

@@ -6,6 +6,6 @@ The ACP group exposes harness agents to programmatic clients. It is an interoper
 
 | Package | Role |
 |---|---|
-| [`acp/`](acp/README.md) | Automation-only ACP server: fresh text sessions, committed assistant output, machine permission policy, cancellation, and connection-owned teardown. |
+| [`acp/`](acp/README.md) | Automation-only ACP server. |
 
 The matching out-of-process subagent client remains in [`subagent/subagent-acp`](../subagent/subagent-acp/README.md) because it implements the subagent provider interface; arbitrary ACP clients may drive the same server contract.

packages/acp/README.zh.md

@@ -6,6 +6,6 @@ ACP（Agent Client Protocol）组将 harness 中的 agent（智能体）公开
 
 | 包 | 职责 |
 |---|---|
-| [`acp/`](acp/README.md) | 仅面向自动化的 ACP 服务器：新文本会话、已提交的 assistant 输出、机器权限策略、取消和由连接负责的清理。 |
+| [`acp/`](acp/README.md) | 仅面向自动化的 ACP 服务器。 |
 
 与之匹配的进程外 subagent 客户端仍位于 [`subagent/subagent-acp`](../subagent/subagent-acp/README.md)，因为它实现 subagent 提供方接口；任意 ACP 客户端都可以按照同一服务器契约驱动该服务器。