Prepare OmniClaw SDK and facilitator release

[Abiorh001]

Summary

• Reframes OmniClaw public docs around clear product surfaces: agent CLI, enterprise/vendor SDK, Financial Policy Engine, seller middleware, and facilitator options.
• Adds SDK-first B2B examples for vendor APIs, machine-to-vendor flows, external x402 facilitators, Circle Gateway nanopayments, and OmniClaw self-hosted exact settlement.
• Adds OmniClaw exact facilitator support, network profile coverage, x402 compatibility helpers, CLI/facilitator tests, and cleaner env documentation.
• Moves the public OmniClaw CLI agent skill into docs and keeps internal agent skill usage separated from shipped user docs.
• Removes stale/generated docs images and cleans example scripts so public examples do not contain local secrets.