Add TypeScript Vercel schema-selection example

typescript/examples/schema_selection/vercel_ai_sdk_generate_object/README.md

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+# Vercel AI SDK `generateObject` schema selection
+
+This example shows the TypeScript counterpart to the Python schema-selection
+examples in this repository.
+
+The enforcement point is schema selection.
+
+Flow:
+
+`compiler state -> host selects schema -> host builds generateObject request -> downstream model call`
+
+## What this example demonstrates
+
+- Compiler-only state drives host schema selection.
+- The host chooses which structured-output schema to offer.
+- `generateObject` is the downstream host behavior, not the authority layer.
+- No model output mutates compiler state.
+- If compiler state does not authorize a schema, the host omits schema selection.
+
+## Boundary
+
+- `@rlippmann/context-compiler` owns authoritative state transitions.
+- The host reads compiler state and selects a Zod schema, or no schema.
+- The host may pass that schema into Vercel AI SDK `generateObject`.
+- The compiler does not select schemas dynamically.
+- The compiler does not derive state from model output.
+
+## Deterministic behavior
+
+Given policy state:
+
+```text
+use python_script
+prohibit shell_command
+```
+
+the host offers the `python_script` schema and does not offer the
+`shell_command` schema.
+
+If state prohibits every known schema, the host omits schema selection and does
+not build a `generateObject` request.
+
+## Test coverage
+
+Tests assert:
+
+- compiler state -> selected schema
+- selected schema -> request config
+- omit schema when state does not authorize one
+
+Primary tests are deterministic and do not call a model.
+
+## Install
+
+```bash
+cd typescript/examples/schema_selection/vercel_ai_sdk_generate_object
+npm install
+```
+
+## Validate
+
+```bash
+npm run build
+npm run typecheck
+npm test
+```
+
+## Run the example
+
+```bash
+npm run example
+```
+
+The example uses a stubbed `generateObject` implementation so the downstream
+behavior stays observable without a live model.