docs(launcher): correct tier from 5 to 2

launcher only imports logz (Tier 1) — it belongs at Tier 2, not 5.
The wrong tier implied it had to be pushed last, when in reality worker,
postgres, mysql, sqlite, valkey, firebase, and httpserver all depend on it
and cannot be tagged before it.

CLAUDE.md

@@ -12,7 +12,7 @@ dependencies are ready and never stopped before the components that depend on th
 
 ## Tier & Dependencies
 
-**Tier:** 5 (application bootstrap only)
+**Tier:** 2 (depends on Tier 1 `logz`)
 **Imports:** `context`, `os`, `os/signal`, `sync`, `syscall`, `time` (stdlib);
 `code.nochebuena.dev/go/logz` (micro-lib)
 **Must NOT import:** `xerrors`, `rbac`, or any domain/application module.