fix(agents): honor heartbeat.model override instead of session model (#14181)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: f19b789057
Co-authored-by: 0xRaini <190923101+0xRaini@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/auto-reply/reply/get-reply-directives.ts

@@ -106,6 +106,7 @@ export async function resolveReplyDirectives(params: {
   aliasIndex: ModelAliasIndex;
   provider: string;
   model: string;
+  hasResolvedHeartbeatModelOverride: boolean;
   typing: TypingController;
   opts?: GetReplyOptions;
   skillFilter?: string[];
@@ -131,6 +132,7 @@ export async function resolveReplyDirectives(params: {
     defaultModel,
     provider: initialProvider,
     model: initialModel,
+    hasResolvedHeartbeatModelOverride,
     typing,
     opts,
     skillFilter,
@@ -391,6 +393,7 @@ export async function resolveReplyDirectives(params: {
     provider,
     model,
     hasModelDirective: directives.hasModelDirective,
+    hasResolvedHeartbeatModelOverride,
   });
   provider = modelState.provider;
   model = modelState.model;