fix(humanize2): reset extraArgs section when list ends for sibling fields

When extraArgs: [] switched section to "agents.extraArgs", subsequent
sibling fields (model, reasoningEffort, permissionMode, sandbox) under
the same agent were silently ignored because section was never reverted.
Now reset section back to "agents" when a non-list-item line is
encountered at indent >= 4.

Author: zevorn

src/config.ts

@@ -193,6 +193,12 @@ function parseSimpleYaml(
       continue;
     }
 
+    // extraArgs list is done — reset section so sibling fields (model,
+    // permissionMode, sandbox) under the same agent are not silently ignored
+    if (section === "agents.extraArgs" && indent >= 4 && currentAgent !== undefined && !trimmed.startsWith("- ")) {
+      section = "agents";
+    }
+
     const separatorIndex = trimmed.indexOf(":");
     if (separatorIndex < 0) {
       continue;

tests/config.test.ts

@@ -129,6 +129,33 @@ describe("humanize2 user config", () => {
     });
   });
 
+  it("loads sibling fields after empty extraArgs under the same agent", async () => {
+    const home = await tempDirectory();
+    const configPath = join(home, "sibling-after-extraargs-config.yaml");
+
+    const contents = [
+      "version: 1",
+      "cacheDir: /tmp/humanize2-cache",
+      "defaultRunTimeoutMs: 12345",
+      "defaultTheme: dark",
+      "agents:",
+      "  codex:",
+      "    extraArgs: []",
+      "    model: gpt-5.5",
+      "    reasoningEffort: xhigh",
+      ""
+    ].join("\n");
+    await writeFile(configPath, contents, "utf8");
+
+    const config = await loadHumanizeConfig({ HUMANIZE2_CONFIG: configPath }, home);
+
+    expect(config.agentDefaults.codex).toMatchObject({
+      model: "gpt-5.5",
+      reasoningEffort: "xhigh",
+      extraArgs: []
+    });
+  });
+
   it("loads workflow retry and script allowlist settings from the user config", async () => {
     const home = await tempDirectory();
     const configPath = join(home, "workflow-config.yaml");