e2e: scope the FrankBook-Pro leg to its own trigger-gated Playwright project

The 11-admin spec walked links that terminate on FrankBook-Pro
(192.168.0.112), which sleeps when idle — every deploy gate timed out
there (measured 2026-10-05, two deploy windows). Split: the frankbook
links move to tests/e2e/specs/19-frankbook.spec.ts under a frankbook
project that run.sh excludes by default and deploy.sh triggers ONLY
when a frankbook blast-radius path changed (the spec, frankbook-pro/,
the homepage registry, the Caddyfile arr vhosts). deploy.sh computes
the trigger from the same BASE..HEAD revision range the plan uses.

tests/e2e_scaffold.bats

@@ -10,7 +10,8 @@ load helpers
     for f in run.sh package.json playwright.config.ts .env.local.example \
              lib/env.ts lib/login.ts \
              specs/00-auth.setup.ts specs/10-homepage.spec.ts specs/11-admin.spec.ts \
-             specs/12-crawl.spec.ts specs/13-sso.spec.ts specs/14-guard.spec.ts; do
+             specs/12-crawl.spec.ts specs/13-sso.spec.ts specs/14-guard.spec.ts \
+             specs/19-frankbook.spec.ts; do
         [ -f "$REPO_ROOT/tests/e2e/$f" ] || {
             echo "missing tests/e2e/$f"
             return 1