fix(core): #2351 review-6 — hasInputRequestMethod O(1) membership probe; rescope Task* header to registry surface

Author: felixweinberger

packages/core/src/shared/inputRequiredEngine.ts

@@ -131,8 +131,7 @@ export async function dispatchInputRequest(
         );
     }
     const method = entry['method'];
-    const membership = codec.validateInputRequest(method, entry);
-    if (!membership.ok && membership.reason === 'not-in-era') {
+    if (!codec.hasInputRequestMethod(method)) {
         throw new SdkError(
             SdkErrorCode.InvalidResult,
             `Invalid input request '${key}': '${method}' is not an embedded request the ${codec.era} revision defines ` +

packages/core/src/wire/codec.ts

@@ -162,6 +162,7 @@ export interface WireCodec {
     /** Registry membership — the deletion story (inbound −32601 by absence; outbound typed local error). */
     hasRequestMethod(method: string): boolean;
     hasNotificationMethod(method: string): boolean;
+    hasInputRequestMethod(method: string): boolean;
 
     // ── Function-only validation surface ──────────────────────────────────
     // The validator-agnostic contract: callers never see a Zod schema, only a

packages/core/src/wire/rev2025-11-25/codec.ts

@@ -58,6 +58,7 @@ export const rev2025Codec: WireCodec = {
     validateNotification: (method: string, raw: unknown) => triState(getNotificationSchema(method), raw),
     // No in-band input-request vocabulary on this era: elicitation, sampling
     // and roots are real wire request methods here (see the registry).
+    hasInputRequestMethod: (): boolean => false,
     validateInputRequest: (): ValidateOutcome<never> => NOT_IN_ERA,
     validateInputResponse: (): ValidateOutcome<never> => NOT_IN_ERA,
 

packages/core/src/wire/rev2025-11-25/schemas.ts

@@ -15,7 +15,9 @@
  * registry; the deprecated Task* TYPES remain importable from the types barrel
  * (Q1-SD2: nameability is constant, runtime availability is version-keyed) but
  * appear in no API signature. Q1 increment 2 — deletions are physical: the
- * 2026-era codec has no Task* schemas at all.
+ * 2026-era REGISTRY has no Task* methods (its frozen building-block copies do
+ * carry the deprecated Task* sub-schemas by composition — soft contamination,
+ * tracked for anchor-exactness adjudication).
  *
  * The only cross-layer dependency is `import type { JSONObject, JSONValue }`
  * from the neutral types barrel — pure structural type aliases with no parse

packages/core/src/wire/rev2026-07-28/codec.ts

@@ -120,6 +120,7 @@ export const rev2026Codec: WireCodec & {
 
     hasRequestMethod: hasRequestMethod2026,
     hasNotificationMethod: hasNotificationMethod2026,
+    hasInputRequestMethod: (method: string): boolean => getInputRequestSchema2026(method) !== undefined,
 
     // ── Function-only validation surface ──
     validateRequest: (method: string, raw: unknown) => triState(getRequestSchema2026(method), raw),