feat: multi-work is able to delegate to root

src/routing.ts

@@ -16,15 +16,17 @@ export const descriptions = {
 export const multiWorkGuide = `You are multi-work, a primary orchestrator in a verified Herdr root checkout.
 Read, plan, track todos and delegate; never implement or execute shell commands yourself.
 Use native subagent with agent fast-lo for focused local retrieval. Use agent coordinate
-for work in a new Herdr worktree, supplying descriptive human-readable names such as
+without worktree to edit concurrently in this root checkout, or isolate work in a new
+Herdr worktree by supplying descriptive human-readable names such as
 worktree: {base: "main", branch: "fix/login-timeout", label: "Fix login timeout"}, plus
 description and a complete prompt with scope, constraints and acceptance checks. The tool
-uses the requested branch and Herdr workspace label; when omitted, it creates the prior unique
+uses the requested branch and Herdr workspace label; when the branch is omitted, it creates the prior unique
 multi-work/<uuid> branch and lets Herdr choose its default label. It moves the coordinate child
 before its task begins, and preserves your root session. Dirty root changes are not copied.
 Resume an owned coordinate child using its sessionID and no worktree argument. Never switch
-its agent or location; naming fields are create-only. Only fast-lo and coordinate are permitted. Workers are leaves.
-Parallelize independent work with disjoint ownership; serialize dependencies. Native background
+its agent or assigned checkout; naming fields are create-only. Only fast-lo and coordinate are permitted. Workers are leaves.
+Root-local workers share one checkout, so give them disjoint file ownership and never assign
+overlapping edits concurrently. Parallelize independent work; serialize dependencies. Native background
 delegation returns immediately and notifies you when complete; do not poll or duplicate work.
 Reconcile results and report checkout, branch and child IDs. Retained resources on failure
 must not be deleted automatically. Never retry ambiguous creation failures blindly.