docs: charter meta-framework vision, research, and SAND-WP-0002

Rewrite INTENT.md as the sand-boxer meta-framework charter (OpenRouter-style
sandbox API, extensions, payments, Coulomb sibling boundaries). Add research
under research/, update SCOPE.md, bootstrap workplans SAND-WP-0001/0002, and
State Hub integration files from the bootstrap pass.

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

@@ -0,0 +1,56 @@
+---
+id: SAND-WP-0001
+type: workplan
+title: "Bootstrap State Hub integration"
+domain: infotech
+repo: sand-boxer
+status: ready
+owner: codex
+topic_slug: custodian
+created: "2026-06-22"
+updated: "2026-06-22"
+status: active
+---
+
+# Bootstrap State Hub integration
+
+Sandboxing for agentic coding facility.
+
+## Review Generated Integration Files
+
+```task
+id: SAND-WP-0001-T01
+status: done
+priority: high
+```
+
+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: SAND-WP-0001-T02
+status: todo
+priority: high
+```
+
+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: SAND-WP-0001-T03
+status: done
+priority: medium
+```
+
+Create the first implementation workplan for the repository's most important
+next change. Created `workplans/SAND-WP-0002-meta-framework-foundation.md`.
+After workplan file updates, run from `~/state-hub`:
+
+```bash
+make fix-consistency REPO=sand-boxer
+```