Refresh SCOPE.md for v0 operational state after WP-0002/0003/0008.
Add history/ INTENT↔SCOPE assessment and ready workplan for the-custodian
e2e shim to close the e2e-framework migration arc.
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.