fix(sdk): gate reasoning effort by runtime allowlist

tests/codex-config.test.cjs

@@ -133,7 +133,11 @@ describe('getCodexSkillAdapterHeader', () => {
     const result = getCodexSkillAdapterHeader('gsd-execute-phase');
     assert.ok(result.includes('spawn_agent'), 'maps to spawn_agent');
     assert.ok(result.includes('agent_type'), 'maps subagent_type to agent_type');
-    assert.ok(result.includes('reasoning_effort'), 'documents reasoning_effort transport');
+    assert.match(
+      result,
+      /Resolved `reasoning_effort="low\|medium\|high\|xhigh"` \(`xhigh` is a GSD\/Codex tier, not a generic runtime enum\) → pass `reasoning_effort`\s+to `spawn_agent` when the runtime\/tool supports it/,
+      'documents reasoning_effort transport',
+    );
     assert.ok(result.includes('do not invent one-off effort literals'), 'keeps effort policy centralized');
     assert.ok(result.includes('fork_context'), 'documents fork_context default');
     assert.ok(result.includes('wait(ids)'), 'documents parallel wait pattern');

tests/commands.test.cjs

@@ -1132,6 +1132,42 @@ describe('resolve-model command', () => {
     assert.strictEqual(output.reasoning_effort, 'xhigh');
   });
 
+  test('does not include reasoning_effort for unsupported runtime overrides', () => {
+    fs.writeFileSync(path.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 result = runGsdTools('resolve-model gsd-planner', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const output = JSON.parse(result.output);
+    assert.strictEqual(output.model, 'openrouter/openai/gpt-5.5');
+    assert.strictEqual(output.profile, 'balanced');
+    assert.ok(!Object.prototype.hasOwnProperty.call(output, 'reasoning_effort'));
+  });
+
+  test('does not include reasoning_effort for per-agent model_overrides', () => {
+    fs.writeFileSync(path.join(tmpDir, '.planning', 'config.json'), JSON.stringify({
+      model_profile: 'balanced',
+      runtime: 'codex',
+      models: { planning: 'opus' },
+      model_overrides: { 'gsd-planner': 'gpt-5.5' },
+    }));
+    const result = runGsdTools('resolve-model gsd-planner', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const output = JSON.parse(result.output);
+    assert.strictEqual(output.model, 'gpt-5.5');
+    assert.strictEqual(output.profile, 'balanced');
+    assert.ok(!Object.prototype.hasOwnProperty.call(output, 'reasoning_effort'));
+  });
+
   test('fails when no agent-type provided', () => {
     const result = runGsdTools('resolve-model', tmpDir);
     assert.ok(!result.success, 'should fail without agent-type');