e2e: Playwright suite for homepage + guard chain; RBAC gate on /admin; fix stale service links

.gitignore

@@ -5,6 +5,13 @@
 # LLM fleet tunables (paths and numbers, never credentials)
 !scripts/*.env
 
+# Playwright e2e: local creds, browser storage states, node artifacts
+tests/e2e/.env.local
+tests/e2e/.auth/
+tests/e2e/node_modules/
+tests/e2e/test-results/
+tests/e2e/playwright-report/
+
 # pi subagent artifacts
 .pi-subagents/