Forward visit methods declared on a delegate superclass under adapt()

[jkschneider]

What's changed

TreeVisitorAdapter collected the visit-like methods to proxy-forward from delegate.getClass().getDeclaredMethods() — the leaf class only. So preVisit/postVisit/visitX declared on a superclass of the delegate were never forwarded, and silently did not fire when the visitor was adapted to another language (C#/Python/Kotlin/Groovy). Java is unaffected because it runs natively, without adapt() — which is why this stayed hidden.

The fix walks the delegate's class hierarchy from the leaf up to — but not into — the language iso-visitor (delegateType), collecting the user's visit-like methods at every level (leaf-first, so the most-derived override wins). Stopping at the iso-visitor matters: crossing into it would forward the framework's own visitX to the foreign-language delegate and break native traversal.

Why it matters

Any visitor that factors shared behavior into a base class (e.g. a common scanning base that overrides preVisit/postVisit) misbehaves under cross-language adapt() today, with no error — the overrides just don't run.

Tests

Two regression tests in TreeVisitorAdapterTest:

• preVisit declared on a TreeVisitor superclass is forwarded.
• visitIdentifier declared on a JavaIsoVisitor superclass is forwarded (exercises the iso-visitor stop-boundary).

Both fail on main and pass with this change; existing adapter tests, rewrite-groovy, and rewrite-core stay green.

Also

Incidental cleanup of the touched file: inline fully-qualified class names replaced with imports, and a few verbose comments trimmed.