The with* functional options and newTree constructor were private and
only used in two places (builder and tests). Replaced with direct
field assignment on &Tree{} literals. Less abstraction, same behavior.
Each() now returns []FsNodeDecl directly. The Binding type was a
redundant subset of FsNodeDecl with a slightly different Remove
signature. Dynamic entries are now expressed uniformly — Remove,
Rename, Children, Aliases all live on FsNodeDecl like everything else.
Also added: Alias() and RenameNode() options, DirNode accepts
[]FsNodeDecl for passing pre-built child slices.
Drop all references to generic context type parameter, Applier,
and type/function aliasing patterns. Document the actual API:
plain closures, pre-bound Children in Bindings, no generics.
Ollie Agent