fix wrong herdr response parse + add labels and branch names to delegations

docs/multi-work.md

@@ -63,13 +63,24 @@ subagent({
     agent: "coordinate",
     description: "Implement API change",
     prompt: "Goal, scope, constraints, and acceptance checks...",
-    worktree: { base: "feature/source" },
+    worktree: {
+        base: "main",
+        branch: "fix/login-timeout",
+        label: "Fix login timeout",
+    },
     background: true,
 });
 ```
 
-`base` identifies a locally available branch or remote-tracking branch. The tool
-resolves its commit and creates a new unique `multi-work/<uuid>` branch with Herdr.
+`base` identifies a locally available branch or remote-tracking branch. Optional
+`branch` chooses the exact new Git branch and optional `label` sets the Herdr workspace
+display label through `herdr worktree create --label`. Both must be nonempty after
+trimming. Prefer concise, descriptive human-readable names. Existing branch validation
+and collision checks apply, and the tool never overwrites a branch. When omitted, the
+tool retains the previous behavior: a unique `multi-work/<uuid>` branch and Herdr's
+default workspace label. Naming fields are creation-only; resumes accept only `sessionID`.
+The tool
+resolves the base commit and creates the branch with Herdr.
 It does not fetch refs or copy uncommitted root changes. Herdr determines the
 checkout path; the tool parses and verifies the returned checkout/workspace.
 Creation explicitly preserves focus with `--no-focus`.