fix(sdk): gate reasoning effort by runtime allowlist

sdk/src/query/config-query.test.ts

@@ -214,6 +214,8 @@ describe('resolveModel', () => {
 
   it('returns runtime reasoning_effort from the same phase-tier source as model', async () => {
     const { resolveModel } = await import('./config-query.js');
+    const { resolveRuntimeTierDefault } = await import('../model-catalog.js');
+    const opusCodexTier = resolveRuntimeTierDefault('codex', 'opus');
     await writeFile(
       join(tmpDir, '.planning', 'config.json'),
       JSON.stringify({
@@ -228,10 +230,35 @@ describe('resolveModel', () => {
     expect(executor).toMatchObject({
       model: 'gpt-5.4',
       profile: 'budget',
-      reasoning_effort: 'xhigh',
+      reasoning_effort: opusCodexTier?.reasoning_effort,
     });
   });
 
+  it('does not leak reasoning_effort from overrides for unsupported runtimes', async () => {
+    const { resolveModel } = await import('./config-query.js');
+    await writeFile(
+      join(tmpDir, '.planning', 'config.json'),
+      JSON.stringify({
+        model_profile: 'balanced',
+        runtime: 'opencode',
+        models: { planning: 'opus' },
+        model_profile_overrides: {
+          opencode: {
+            opus: { model: 'openrouter/openai/gpt-5.5', reasoning_effort: 'high' },
+          },
+        },
+      }),
+    );
+
+    const planner = (await resolveModel(['gsd-planner'], tmpDir)).data as Record<string, unknown>;
+
+    expect(planner).toMatchObject({
+      model: 'openrouter/openai/gpt-5.5',
+      profile: 'balanced',
+    });
+    expect(planner).not.toHaveProperty('reasoning_effort');
+  });
+
   it('resolveModel uses workstream config when --ws is specified', async () => {
     const { resolveModel } = await import('./config-query.js');
     // Root config: balanced profile → gsd-executor resolves to 'sonnet'

sdk/src/query/config-query.ts

@@ -30,8 +30,11 @@ import {
   VALID_PROFILES,
   getAgentToModelMapForProfile,
   resolveRuntimeTierDefault,
+  runtimesWithReasoningEffort,
 } from '../model-catalog.js';
 
+const RUNTIMES_WITH_REASONING_EFFORT = runtimesWithReasoningEffort();
+
 // ─── configGet ──────────────────────────────────────────────────────────────
 
 /**
@@ -151,7 +154,11 @@ function resolveRuntimeTier(config: Record<string, unknown>, tier: string): Runt
   const userEntry = normalizeRuntimeTierEntry(runtimeOverrides?.[tier]);
 
   if (!builtin && !userEntry) return null;
-  return { ...(builtin ?? {}), ...(userEntry ?? {}) };
+  const merged = { ...(builtin ?? {}), ...(userEntry ?? {}) };
+  if (!RUNTIMES_WITH_REASONING_EFFORT.has(runtime)) {
+    delete merged.reasoning_effort;
+  }
+  return merged;
 }
 
 /**