docs: record batch tool admission and fit the turn-flow summary

The tool executor merge added ToolBatchInput.toolSet; the subsystem page's type-equivalence block now matches it. The architecture turn-flow line names step-admitted tool schemas in one line so the page stays within its word budget.

docs/architecture.md

@@ -83,8 +83,7 @@ A **step** is one model request plus the tools it calls. A **turn** is zero or m
 ```text
 turn/start
   claim next-step input plus one queued message
-  snapshot Session model selection; resolve the step's conditional tools
-  assemble prompt sections + admitted tool schemas
+  snapshot Session model selection; assemble prompt sections + step-admitted tool schemas
   -> agent/pre-step; project runtime context at fallback
                                      reject | enter(messages, startsRequestSeries?)
      reject, or a first enter rewritten empty -> close the turn with no step

docs/architecture.zh.md

@@ -87,8 +87,7 @@ AgentLoop 初始化 Agent，失败则回滚，并在启动已排队工作前等
 ```text
 turn/start
   claim next-step input plus one queued message
-  snapshot Session model selection; resolve the step's conditional tools
-  assemble prompt sections + admitted tool schemas
+  snapshot Session model selection; assemble prompt sections + step-admitted tool schemas
   -> agent/pre-step; project runtime context at fallback
                                      reject | enter(messages, startsRequestSeries?)
      reject, or a first enter rewritten empty -> close the turn with no step

docs/subsystems/tools.md

@@ -202,6 +202,11 @@ interface ToolBatchInput {
    * Undefined for standalone calls outside an Agent, such as a service invocation.
    */
   readonly agent?: Agent
+  /**
+   * Step admission for every call in the batch, including program subcalls.
+   * Undefined admits only unconditional registrations.
+   */
+  readonly toolSet?: ResolvedToolSet
   /**
    * Committed model step receiving root call/result events; requires `agent`.
    * Undefined when `agent` is absent or for calls outside a model response, such

docs/subsystems/tools.zh.md

@@ -202,6 +202,11 @@ interface ToolBatchInput {
    * Undefined for standalone calls outside an Agent, such as a service invocation.
    */
   readonly agent?: Agent
+  /**
+   * Step admission for every call in the batch, including program subcalls.
+   * Undefined admits only unconditional registrations.
+   */
+  readonly toolSet?: ResolvedToolSet
   /**
    * Committed model step receiving root call/result events; requires `agent`.
    * Undefined when `agent` is absent or for calls outside a model response, such