Add OneCLI gateway

This skill owns the full OneCLI integration. NanoClaw core supplies the generic gateway seam and existing skill engine.

Install the provider payload

Copy the package's native adapter, tests, and agent guidance into their normal NanoClaw paths. NanoClaw core owns the approval workflow.

payload/src/gateway-providers/onecli-files.ts -> src/gateway-providers/onecli-files.ts
payload/src/gateway-providers/onecli-files.test.ts -> src/gateway-providers/onecli-files.test.ts
payload/src/gateway-providers/onecli.ts -> src/gateway-providers/onecli.ts
payload/src/gateway-providers/onecli.test.ts -> src/gateway-providers/onecli.test.ts
payload/src/gateway-providers/onecli-install.test.ts -> src/gateway-providers/onecli-install.test.ts
payload/container/skills/onecli-gateway/SKILL.md -> container/skills/onecli-gateway/SKILL.md
payload/container/skills/onecli-gateway/instructions.md -> container/skills/onecli-gateway/instructions.md
payload/docs/onecli-upgrades.md -> docs/onecli-upgrades.md