Refine CI gate workflow coverage

[IEvangelist]

Summary

• make the CI change detector treat workflow file changes as affecting both frontend and apphost validation
• include src/statichost in apphost change detection because AppHost builds StaticHost transitively
• remove the duplicate integration workflow and fold its dist/index.html assertion into frontend-build
• simplify ci-gate so it only validates the jobs that provide distinct coverage

Why

The required ci-gate check could report success without exercising the workflows it depended on. A pull request that only changed files under .github/workflows could skip frontend-build and apphost-build while still passing ci-gate.

There was a second gap for src/statichost changes. AppHost references StaticHost directly, so those changes should be treated as apphost-affecting work.

The old integration workflow was also mostly duplicating frontend-build and apphost-build. It rebuilt both sides from source, did not consume artifacts from the other jobs, and did not perform a real smoke or integration check.

Testing

• validated .github/workflows/ci.yml and .github/workflows/frontend-build.yml after the edits
• ran git diff --check to verify the final diff is clean

[Copilot]

Pull request overview

This PR tightens the CI gating logic so that changes to GitHub Actions workflows (and src/statichost) correctly trigger the relevant validation jobs, and removes a largely-duplicative integration workflow in favor of consolidating its only unique assertion into the frontend build.

Changes:

• Update CI change detection to treat .github/workflows/** edits as affecting both frontend-build and apphost-build, and include src/statichost as apphost-affecting.
• Remove the integration.yml workflow and the corresponding integration-test job from ci.yml.
• Add a dist/index.html existence check to frontend-build.yml to preserve the one unique validation previously performed in integration.yml.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/integration.yml	Removed duplicate workflow (frontend+apphost rebuild + index.html check).
.github/workflows/frontend-build.yml	Adds dist/index.html assertion after the build.
.github/workflows/ci.yml	Improves change detection (workflow + statichost), and simplifies ci-gate dependencies by dropping the removed integration job.

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