fix(tools): collapse code-mode executor to run_code for model-direct calls

wireSchemas() already advertised only run_code under mode: 'code', but the
executor resolved every call through get(), which returns the full visible
map plus the reserved transport. A model could name a native tool directly
and bypass run_code entirely. Route the execution-path lookups through a
new private resolveExecution() that applies the mode collapse at the
operation boundary: model-direct calls under 'code' may only name run_code
(UNKNOWN_TOOL otherwise), while SDK sub-dispatches (parent token set) keep
every visible tool. get()/schemas() public semantics are unchanged.

The denial happens at createExecution, before the extensible policy
pipeline — pre-execute listeners, approval ask, and guards never observe
a call that is deterministically denied. A collapsed call honors the
pre-dispatch cancellation contract, routes aborted results through the
visible tool's finalizeContent, and captures the finalizer before
argument materialization.

Regenerated docs, catalogs, graphs, scoped events, re-recorded
translation pairs, and updated test assertions.

Fixes #1815

docs/config-catalog.md

@@ -2481,16 +2481,14 @@ Requires: `systemPrompt`
 /** Plugin config: how the registered tools are presented to the model. */
 export interface Config {
   /**
-   * Model presentation for agents that declare none of their own. `native`
-   * (default) sends every visible schema; `code` sends only `run_code` plus a
-   * generated SDK prompt; `both` sends both forms. Code modes require a
-   * `ctx.codeRuntime` whose `language` has a registered SDK renderer
-   * (TypeScript or Python) and fail prompt assembly when it is absent or has
-   * no renderer. Under `code`, native names in `toolOrder` are invalid.
-   *
-   * One agent overrides this for itself with {@link ToolRegistry.presentAs},
-   * which is how an agent preset composes a Code Mode agent beside native
-   * ones in the same process.
+   * Model presentation. `native` (default) sends every visible schema; `code`
+   * sends only `run_code` plus a generated SDK prompt and collapses the
+   * executor to the same surface (a model-direct call may only name
+   * `run_code`; `run_code` SDK sub-dispatches keep every visible tool); `both`
+   * sends both forms. Code modes require a `ctx.codeRuntime` whose `language`
+   * has a registered SDK renderer (TypeScript or Python) and fail prompt
+   * assembly when it is absent or has no renderer. Under `code`, native names
+   * in `toolOrder` are invalid.
    */
   mode?: ToolPresentationMode
   /**