fix: address all seven final-gate findings for typed api blocks

B1: qualify each generated __wrn_api_check_* assertion name with a short
hash of the page's path (relative to app/, for reproducibility across
checkouts) so two pages declaring a same-named block no longer collide
with an identical type alias (TS2300).

B2: skip assertion emission for any block that is not client-mode, or
that has zero declared request fields. ssr sectioned blocks can never
declare a request and always fell back to Record<string, never>, whose
keyof is `string` -- making the key-exactness arm of AssertAssignable
evaluate to false unconditionally (TS2344) on every ssr sectioned block
regardless of correctness. Chose to skip both non-client blocks and
zero-field client blocks, since neither has anything meaningful to
assert type-safety about.

B3: only resolve the endpoint's input (query params / ctx.req.json())
when the endpoint declares an input schema. Previously the router-set
fix accidentally read the request body unconditionally, so a handler
with no input schema that parses the request itself hit
ERR_BODY_ALREADY_USED.

B4: run response/error bodies in client-mode api blocks through
eraseFunctionTypes, matching every other browser-bound body in
client-codegen.ts, so a TypeScript-only construct inside one (e.g. an
annotated locally-declared function) doesn't reach the .mjs artifact.

B5: only exclude "api" from state/prop destructuring in the generated
browser module when the page actually has client-mode api blocks (i.e.
there is a real `api` binding to shadow). Previously "api" was always
excluded, so a page with `state api` and no api blocks got an
undeclared `api` reference (ReferenceError) in client code.

B6: prefix each emitted assertion with `export`, so it isn't flagged as
an unused local under a downstream project's noUnusedLocals (TS6196).

B7: wrnexusCallApi now resolves with undefined for an ok 204/205
response, or an ok response with an empty/unparseable body, instead of
rejecting with "Response was not valid JSON" -- matching the spec's
failure table (error path only for non-2xx, network failure, or an
actually unparseable body on a non-empty response).

Regenerated examples/basic-app's generated types and editor bundles to
match. Confirmed the example's type gate still fails when an
unaccepted field is added to a request body, and passes cleanly
otherwise.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

editors/vscode/src/extension.bundle.cjs

@@ -1,4 +1,4 @@
-// WRN editor extension source hash: 7ecb4672607b87fdb848f1b52e80430129a5bfda31c9724e14595e4acc1fb1b7
+// WRN editor extension source hash: bdf6f7f12c426181cad9a70f9ad1f3df2212bc487116ff3af97d2effd68b0c53
 // WRN editor extension generator hash: 456d1d614e44e5fb1f19b784176c09cf2ade9b64ef73a17934c2698150b62728
 "use strict";
 var __commonJS = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);