Infrastructure: land the public desktop driver

[Jason Morse (JasonVMo)]

Summary

• Add the public @fluentui-react-native/desktop-driver package with a client-neutral W3C remote end, deterministic fake host, typed client, WebdriverIO runner, JSON CLI, bounded agent API, and confined artifacts.
• Split reusable desktop Storybook orchestration from its React Native runtime, generate platform manifests and authenticated runtime identity, and supervise Storybook, Metro, and the driver under owned lifecycles.
• Remove the dedicated apps/storybook/scripts and windows-tests harnesses in favor of the shared storybook-desktop CLI.
• Add smoke --mode stories|stories-and-tests, plus Windows and Win32 PR smoke jobs with artifact upload; macOS build steps now use the same shared CLI.

This supersedes the older Appium-oriented branch shape described in #4258 with the fresh Appium-free Stage 1 architecture.

Infrastructure workstream coverage

• Fixes Infrastructure: Land the desktop test driver on main #4258.
• Related to Infrastructure workstream #4275.
• Partially addresses Infrastructure: Decide the disposition of the Windows Jest smoke harness #4254 by retiring the dedicated Windows Jest/WinAppDriver harness and app-local lifecycle scripts. Remaining native focus-interaction parity belongs in the portable native-provider work.
• Partially addresses Infrastructure: Add accessibility assertions to Storybook story tests #4255 with initial Button, Checkbox, and Input role/state/value assertions in static parameters.desktopDriver plans; the broader accessibility cohort, normalization table, and report summary remain open.
• Partially addresses Infrastructure: Add Storybook end-to-end test pipelines #4256 by adding PR-triggered Windows and Win32 Storybook smoke jobs, artifact upload, shared macOS build commands, full native story traversal, and fake-backend authored-plan execution. Native-provider parity, flake policy, and quarantine remain open.
• Builds on the completed Win32 endpoint and initial pipeline work in Infrastructure: Add a Win32 (Paper) Storybook endpoint #4259 and Create initial storybook pipelines for desktop platforms #4279.
• Leaves Infrastructure: Prove the desktop test driver on real platforms and pass its release gate #4257 and Infrastructure: Deliver a reliable Windows Composition screenshot capture path #4260 open for real native driver providers, release proof, and Windows Composition capture.

Current platform boundary

• stories traverses the complete supported native catalog.
• stories-and-tests performs the same traversal and then runs tagged authored plans against the Stage 1 manifest-derived fake target.
• Windows currently excludes Accordion and Callout because both still fail-fast the RNW 0.81 Fabric host during traversal.
• Win32 currently excludes Accordion and ListItem; Callout remains covered through the Paper endpoint.

Validation

• yarn build
• yarn workspace @fluentui-react-native/storybook-desktop test --runInBand — 33 tests passed
• Storybook desktop and app lint/format checks
• yarn lint-lockfile
• yarn change:check
• yarn check-publishing
• Windows Storybook stories-and-tests — 136 native stories and 3 authored plans passed
• Win32 Storybook stories-and-tests — 130 native stories and 3 authored plans passed

[github-actions]

Bundle size report

Tree-shaken production Metro bundles. Component costs are relative to their platform shell; shell costs are absolute.

Platform	Scenario	Baseline cost	Current cost	Cost delta	Change	Gzip delta	Module delta
macos	shell	801.3 KiB	801.3 KiB	0.0 KiB	0.00%	0.0 KiB	+0
macos	components-button	46.4 KiB	46.4 KiB	0.0 KiB	0.00%	0.0 KiB	+0
macos	components-catalog	263.8 KiB	263.6 KiB	-0.2 KiB	-0.06%	-0.0 KiB	+0
win32	shell	806.5 KiB	806.5 KiB	0.0 KiB	0.00%	0.0 KiB	+0
win32	components-button	46.4 KiB	46.4 KiB	0.0 KiB	0.00%	0.0 KiB	+0
win32	components-catalog	263.8 KiB	263.7 KiB	-0.2 KiB	-0.06%	-0.1 KiB	+0
windows	shell	810.2 KiB	810.2 KiB	0.0 KiB	0.00%	0.0 KiB	+0
windows	components-button	46.5 KiB	46.5 KiB	0.0 KiB	0.00%	0.0 KiB	+0
windows	components-catalog	263.6 KiB	263.5 KiB	-0.2 KiB	-0.06%	-0.0 KiB	+0

The job is advisory: size changes are reported but do not fail the pull request. Bundle or analysis errors still fail.

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