chore: replace web-dev-server with cem serve

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{
  "valid": true,
  "errors": [],
  "warnings": [],
  "input": "chore: replace web-dev-server with cem serve"
}

[Copilot]

Pull request overview

This PR migrates local development and Playwright’s non-CI web server from @web/dev-server to cem serve, consolidating/adjusting CEM configuration accordingly.

Changes:

• Replace web-dev-server usage with cem serve for local dev (wireit dev) and for Playwright’s local webServer command.
• Add a root .config/cem.yaml and adjust existing CEM config under elements/.
• Update Playwright demo navigation URL construction and bump @pwrs/* tooling dependencies.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
web-dev-server.config.js	Removed legacy WDS configuration (and its associated pre-run filesystem writes).
docs/demo/web-dev-server.demo.config.js	Removed WDS demo server config formerly used by Playwright.
.config/cem.yaml	Added root CEM config to support cem serve and demo discovery.
elements/.config/cem.yaml	Removed sourceControlRootUrl (now provided by root config).
playwright.config.ts	Switch Playwright’s local webServer command to cem serve.
tools/pfe-tools/test/playwright/PfeDemoPage.ts	Update demo URL routing logic and simplify constructor signature.
tools/pfe-tools/package.json	Bump @pwrs/mappa version used by pfe-tools.
package.json	Switch wireit dev command to cem serve and bump @pwrs/cem / @pwrs/mappa (plus optional platform deps).
package-lock.json	Lockfile updates for the above dependency changes (including license metadata changes).

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[github-actions]

SSR Test Run for e9ea075: Report