feat(browser-automation): add playwright-cli as browser automation provider

- Add playwright-cli to BrowserAutomationProviderSchema enum
- Add playwright-cli to BuiltinSkillNameSchema
- Create playwrightCliSkill with official Microsoft template
- Update skill selection logic to handle 3 providers
- Add comprehensive tests for schema and skill selection
- Regenerate JSON schema

Closes #<issue-number-if-any>

src/config/schema/browser-automation.ts

@@ -4,6 +4,7 @@ export const BrowserAutomationProviderSchema = z.enum([
   "playwright",
   "agent-browser",
   "dev-browser",
+  "playwright-cli",
 ])
 
 export const BrowserAutomationConfigSchema = z.object({
@@ -12,6 +13,7 @@ export const BrowserAutomationConfigSchema = z.object({
    * - "playwright": Uses Playwright MCP server (@playwright/mcp) - default
    * - "agent-browser": Uses Vercel's agent-browser CLI (requires: bun add -g agent-browser)
    * - "dev-browser": Uses dev-browser skill with persistent browser state
+   * - "playwright-cli": Uses Playwright CLI (@playwright/cli) - token-efficient CLI alternative
    */
   provider: BrowserAutomationProviderSchema.default("playwright"),
 })