chore: apply formatting and add WARP guidance

[office-exsitu]

Summary of changes

• Apply repository formatting standards across JS/JSON and configs using npm run format (wp-scripts)
• Attempt PHP code style fixes via npm run lint:php:fix (skipped: phpcbf not available in this environment)
• Add WARP.md with development workflow and common commands for Warp terminal users
• Keep package/composer manifests and lockfiles in sync and formatted

Technical implementation details

• Ran npm ci to ensure local formatter availability
• Executed npm run format (wp-scripts) which formatted:
  • .wp-env.json, package.json, package-lock.json, pnpm-lock.yaml
  • src/settings/* files (JS)
  • JSON schemas in includes/schemas/*
• PHP auto-fix step attempted via npm run lint:php:fix but phpcbf is not installed on this machine; no PHP auto-fixes were applied
• Staged and committed all resulting changes in a single commit

Diff summary (vs origin/trunk)

11 files changed, 44294 insertions(+), 39191 deletions(-)

Key files touched:

• .wp-env.json
• WARP.md (new)
• composer.json, composer.lock
• includes/schemas/mcp-2025-06-18.json
• includes/schemas/wordpress-mcp-extensions.json
• package.json, package-lock.json, pnpm-lock.yaml
• src/settings/AuthenticationTokensTab.js, src/settings/DocumentationTab.js

Testing steps

1. Install dependencies
   • composer install
   • npm install
2. Build or start the admin UI (optional)
   • npm run start (dev) or npm run build
3. Run PHP unit tests
   • vendor/bin/phpunit --testsuite wordpress-mcp
4. Sanity check admin screen:
   • Open WP Admin → Settings → WordPress MCP and ensure UI loads without errors

Related issues/tickets

• N/A (please link any relevant issues)