Add create_capability_request_write_router with host workflow callbacks, CapabilityRequestReroute schema, HubCoreMCPServer.attach_to() with CORE_TOOL_NAMES exclude filtering, tests, and mark HUB-WP-0002 finished.
Set AGENTS.md purpose and developer commands, mark bootstrap tasks done, and seed HUB-WP-0002 for remaining CUST-WP-0048 adapter seams.
