Add State Hub bootstrap workplan and agent integration files

Seed workplans/ with bootstrap workplan to satisfy ADR-001 C-01.
Includes regenerated dev-hub session-protocol and agent instruction files.

workplans/DOMAIN-WP-0001-statehub-bootstrap.md

@@ -0,0 +1,58 @@
+---
+id: DOMAIN-WP-0001
+type: workplan
+title: "Bootstrap State Hub integration"
+domain: communication
+repo: domain-tree
+status: ready
+owner: codex
+topic_slug: communication
+created: "2026-06-22"
+updated: "2026-06-22"
+state_hub_workstream_id: "a90a80db-39bb-440c-ac05-2ad6faab589b"
+---
+
+# Bootstrap State Hub integration
+
+Domain tree modeling utilities.
+
+## Review Generated Integration Files
+
+```task
+id: DOMAIN-WP-0001-T01
+status: todo
+priority: high
+state_hub_task_id: "c0ef631e-b178-4e77-a8fd-41c8e810f6fe"
+```
+
+Review `INTENT.md`, `SCOPE.md`, `AGENTS.md`, and `.custodian-brief.md`.
+Replace generated placeholders with repo-specific facts where needed.
+
+## Verify Local Developer Workflow
+
+```task
+id: DOMAIN-WP-0001-T02
+status: todo
+priority: high
+state_hub_task_id: "d975ca87-7e29-4a5f-8761-e5151ce2cdd4"
+```
+
+Identify the repo's install, test, lint, build, and run commands. Add or refine
+those commands in the agent instructions so future coding sessions can verify
+changes confidently.
+
+## Seed First Real Workplan
+
+```task
+id: DOMAIN-WP-0001-T03
+status: todo
+priority: medium
+state_hub_task_id: "3b9ed480-4009-4ad3-a1d9-38785561fb15"
+```
+
+Create the first implementation workplan for the repository's most important
+next change. After workplan file updates, run from `~/state-hub`:
+
+```bash
+make fix-consistency REPO=domain-tree
+```