docs(tools): correct three comment claims about what defineTool and the subscript path do

"defineTool compiles an object root, so the annotation is a bare
TypedDict class name that opens nothing" is a false universal:
parameterSchemaSpecToJsonSchema compiles an OPEN object root, so an
empty parameter table and one with unrepresentable field names both
degrade to dict[str, Any], which opens one bracket. The conclusion the
sentence carries is unaffected -- 1 or 2 against a 182 cap -- so say
"a bare TypedDict class name or dict[str, Any], neither of which
carries a chain", in the JSDoc and the test comment that copied it.

pyScalar's docstring said the subscript tool-name comment quotes
"through the same call". It quotes through its own JSON.stringify call
site in renderToolsSdkPy and never reaches pyScalar, which only takes
const/enum scalars. Same function, different call site.

The mode-'both' test attributed assembly.tools to the public schemas().
That projection is wireSchemas, wired at ctx.systemPrompt.tools.

packages/core/tools/tests/code-mode.spec.ts

@@ -353,8 +353,9 @@ describe('mode-aware wire contribution', () => {
   it("assembles under a python runtime in mode 'both' as well, SDK and schema together", async () => {
     // `both` reaches the same wireSchemas/requireCodeRuntime/SDK-section code
     // as `code`, so this pins the mode-by-language matrix rather than a
-    // separate path — including that `schemas()` under `both` projects the
-    // Python flavor instead of hitting the flavor-table guard.
+    // separate path — including that the `wireSchemas` projection behind
+    // `assembly.tools` picks the Python flavor under `both` instead of hitting
+    // the flavor-table guard.
     const { ctx, systemPrompt } = await setup({ mode: 'both', runtime: { language: 'python' } })
     registerEcho(ctx)
     const assembly = await systemPrompt.assemble()