Remove unused parser resource plumbing

docs/internal/overview.md

@@ -76,6 +76,8 @@ rendering. A session owns the mutable backend tree for one invocation; parsing
 and presentation reuse that session. The adapter returns raw values and neutral
 syntax failures to core. It does not own the registry, typed input preparation,
 integration declarations, provider acquisition, or native report rendering.
+Parser options carry flag-alias selection; invocation context and streams stay
+with core, while backend output destinations discard and help uses a local buffer.
 Cobra and pflag imports remain inside this package.
 
 ## Optional modules