ww imports: reject init bindings before recovery

docs/spec.md

@@ -328,6 +328,21 @@ ImportPath    = ident { "." ident } .
   Neither form exposes an imported declaration as a bare `Name`; ordinary
   unqualified lookup remains limited to lexical, builtin, and same-package
   declarations.
+- An import whose effective file-local qualifier is `init` is invalid. This
+  includes both `import init acme.codec;` and an unaliased import whose target
+  declares `package init;`. Each resolved occurrence is rejected at its first
+  import-spec token (the explicit alias when present, otherwise the first path
+  token) as `cannot import package as init - init must be a func`. The rejected
+  qualifier is never installed and does not participate in unused-import,
+  duplicate-binding, or declaration/import-collision recovery; consequently a
+  later `init.Name` independently reports an undefined `init`. Repeated invalid
+  occurrences each report the core error. Import resolution retains
+  precedence, so a missing target fails as missing without an additional
+  effective-`init` error. A resolved rejected occurrence remains source and
+  graph provenance for its exact dotted target: only its file-local qualifier
+  binding is absent. Canonical package, import, graph, action, artifact,
+  symbol, `.wwi`, publication, and persistence identity never derives from the
+  rejected qualifier or from the target's declared name.
 - `import _ acme.codec;` is a blank side-effect import. The lone `_` creates no
   qualifier, exposes no bare declaration, and is never diagnosed as unused.
   It is nevertheless a real import occurrence: resolution and all missing,