feat(client): encapsulated support for Presence

[jason-ha]

Expose getPresenceFromDataStoreContext API to allow
Presence use in the encapsulated API model.

In this minimal implementation, Presence can be
injected on demand, but all injection requests
are expected to be from the same module.

Future changes:

• Add loader era initialization - new API
• Expand compat boundaries and checks where it is
  possible that runtime package might be mismatched.

Add example use to @fluid-example/app-integration-external-views that shows cursors.

AB#51457

[Copilot]

Pull Request Overview

This PR refactors the Container Extension system to support runtime compatibility checking and versioning. It introduces a factory-based instantiation pattern, moves extension-related types to runtime-definitions, and adds support for accessing extensions via data store contexts.

Key changes:

• Introduced ContainerExtensionProvider interface and compatibility checking infrastructure
• Refactored ContainerExtensionFactory from a constructor type to an interface with explicit instantiation methods
• Added getPresenceFromDataStoreContext API for legacy/alpha access pattern
• Updated examples to demonstrate cursor presence using the new API

Reviewed Changes

Copilot reviewed 28 out of 29 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Updated TypeScript version dependencies and added tinylicious dev dependency
packages/runtime/runtime-definitions/src/containerExtensionProvider.ts	New file defining extension provider interfaces and compatibility details
packages/runtime/runtime-definitions/src/dataStoreContext.ts	Added FluidDataStoreContextInternal interface extending ContainerExtensionProvider
packages/runtime/runtime-definitions/src/index.ts	Exported new extension-related types
packages/runtime/container-runtime/src/containerRuntime.ts	Implemented compatibility checking and factory-based extension instantiation
packages/runtime/container-runtime/src/dataStoreContext.ts	Added getExtension method to FluidDataStoreContext
packages/runtime/container-runtime-definitions/src/containerExtension.ts	Refactored ContainerExtensionFactory and added ExtensionInstantiationResult
packages/framework/presence/src/getPresence.ts	Implemented new factory pattern and added getPresenceFromDataStoreContext
examples/view-integration/external-views/	Updated to use presence via data store context with cursor tracking example

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

[github-actions]

🔗 Found some broken links! 💔

Run a link check locally to find them. See
https://github.com/microsoft/FluidFramework/wiki/Checking-for-broken-links-in-the-documentation for more information.

linkcheck output

> fluid-framework-docs-site@0.0.0 ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-docs-site@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> fluid-framework-docs-site@0.0.0 check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

 ELIFECYCLE  Command failed with exit code 1.

[WillieHabi]

Looks good to me!