chore: infer tool params (#241)

Moves the `schema.parse` call to the calling side of the handler, so we
don't have to duplicate it everywhere.

src/context.ts

@@ -124,7 +124,7 @@ export class Context {
 
   async run(tool: Tool, params: Record<string, unknown> | undefined) {
     // Tab management is done outside of the action() call.
-    const toolResult = await tool.handle(this, params);
+    const toolResult = await tool.handle(this, tool.schema.inputSchema.parse(params));
     const { code, action, waitForNetwork, captureSnapshot, resultOverride } = toolResult;
     const racingAction = action ? () => this._raceAgainstModalDialogs(action) : undefined;