Add artifact vault contents

projects/dotfiles/049-pi-subagents-batch-concurrency-task.md

@@ -0,0 +1,33 @@
+---
+status: open
+parent: "[[027-pi-subagents-implementation-spec-task]]"
+blocked-by:
+  - "[[046-pi-subagents-minimal-tracer-bullet-task]]"
+tags:
+  - ticket/task/afk
+---
+
+# Add batch spawning and bounded concurrency
+
+## Question
+
+Add batch spawn support that accepts multiple subagent requests, returns child ids immediately, and runs all accepted children through the same supervisor with configurable concurrency.
+
+## What to build
+
+Extend the non-blocking spawn path from one child to many children.
+Batch entries should use the same request semantics as single spawn entries.
+The supervisor should preserve accepted child records, report per-child spawn failures, and enforce a configurable concurrency limit without hiding queued work from status surfaces.
+
+## Acceptance criteria
+
+- [ ] Batch spawn validates every entry with the same rules as single spawn.
+- [ ] A batch request returns accepted child ids and initial metadata without waiting for completion.
+- [ ] `subagent_list` shows active children and a bounded recent terminal history.
+- [ ] `maxConcurrent` limits simultaneous running children while preserving queued records.
+- [ ] Partial spawn failures are reported per requested child without losing accepted children.
+
+## Implementation Notes
+
+All spawns remain non-blocking.
+Do not add a wait-mode parameter in this slice.