fix: preserve logical mutation intent

src/adapters/http/http-execution-v3.ts

@@ -4,6 +4,7 @@ import {
   type InstalledHttpContract,
 } from "../../contracts/external-contract-runtime.ts";
 import type { CacheScopeSnapshot } from "../../contracts/server-state-scope.ts";
+import type { MutationIntent } from "../../contracts/mutation-intent.ts";
 import {
   decodeJsonBytes,
   isEffectivelyEmpty,
@@ -19,7 +20,6 @@ import {
 import {
   certaintyForAbandonedAttempt,
   classifyProblemEffect,
-  type MutationIntentContext,
   type PhysicalAttemptState,
 } from "./http-effect-certainty.ts";
 import { parseRetryAfter } from "./retry-policy.ts";
@@ -130,7 +130,7 @@ export type CancellationOwner =
 export interface HttpExecutionContext {
   readonly signal?: AbortSignal;
   readonly scope: CacheScopeSnapshot;
-  readonly intent?: MutationIntentContext;
+  readonly intent?: MutationIntent;
 }
 
 export interface ContractHttpExecutor {
@@ -370,7 +370,7 @@ export function createContractHttpExecutor(
     if (contract.requestBody === "JSON") {
       headers["Content-Type"] = "application/json";
     }
-    if (context.intent?.idempotencyKey) {
+    if (isCommand && context.intent?.idempotencyKey) {
       headers["Idempotency-Key"] = context.intent.idempotencyKey;
     }