Release v0.2.27 — superglobals(true) parity + drop-in LAMP Mixed-mode

- $_GET/$_SESSION et al. populated per request in superglobals(true) mode
- $g->session aliased to $_SESSION (same array)
- Unsafe lifecycle combos throw at boot
- examples/lamp-scaffold + SuperglobalsParityTest
- Known issue: Symfony coroutine-mode session concurrency (use enableCoroutine(false))