docs: Add local markdown docs references to instructions

Author: ntucker

.github/copilot-instructions.md

@@ -2,5 +2,8 @@
 - Use [@data-client/react guide](.github/instructions/react.instructions.md) for React.
 - Use [@data-client/test guide](.github/instructions/test.instructions.md) when writing tests.
 - Use [@data-client/manager guide](.github/instructions/manager.instructions.md) when writing custom Managers for @data-client/react.
+- Use markdown files in the [API docs](docs/core/api) directory to validate API usage.
+- Use markdown files in the [guides](docs/core/guides) directory to help with more specific use cases.
+- use markdown files in the [REST](docs/rest) directory to help building REST APIs.
 - If you are not sure about file content or codebase structure pertaining to the user’s request, use your tools to read files and gather the relevant information: do NOT guess or make up an answer.
 - Place API definitions and custom managers in the 'resources' directory.

.github/instructions/manager.instructions.md

@@ -6,6 +6,11 @@ applyTo: '**/*.ts'
 [Managers](https://dataclient.io/docs/api/Manager) are singletons that handle global side-effects. Kind of like useEffect() for the central data store.
 They interface with the store using [Controller](https://dataclient.io/docs/api/Controller), and [redux middleware](https://redux.js.org/tutorials/fundamentals/part-4-store#middleware) is run in response to [actions](https://dataclient.io/docs/api/Actions).
 
+Use [Manager API docs](docs/core/api/Manager.md) to validate usage.
+
+Always use `actionTypes` when comparing action.type. Refer to [Action API docs](docs/core/api/Actions.md)
+for list of actions and their payloads.
+
 ## Dispatching actions
 
 [Controller](https://dataclient.io/docs/api/Controller) has dispatchers:

.github/instructions/test.instructions.md

@@ -87,7 +87,9 @@ type Interceptor = ResponseInterceptor | FetchInterceptor;
 
 # Official Documentation Links
 
-- [Fixtures and Interceptors](https://dataclient.io/docs/api/Fixtures)
-- [renderDataHook()](https://dataclient.io/docs/api/renderDataHook)
+- [Fixtures and Interceptors](https://dataclient.io/docs/api/Fixtures) or [Fixtures and Interceptors](docs/core/api/Fixtures.md)
+- [renderDataHook()](https://dataclient.io/docs/api/renderDataHook) or [renderDataHook()](docs/core/api/renderDataHook.md)
+- [MockResolver](docs/core/api/MockResolver.md)
+- [makeRenderDataHook()](docs/core/api/makeRenderDataHook.md)
 
 **ALWAYS follow these patterns and refer to the official docs for edge cases.**