SPM agent connectors v0.1.0

Public connector package for SPM remote MCP.\n\nIncludes:\n- Codex MCP setup instructions for https://getspm.com/v1/mcp\n- Authentication helper and metadata doctor\n- Functional remote MCP smoke test covering temporal memory, context packs, verification, graph query, preflight and action report\n- Public connector validation guard to keep the repository connector-only and free of private core code\n\nSPM core remains private. The hosted MCP endpoint requires a project-scoped SPM token and does not expose billing, checkout, invoice payment, customer portal or destructive admin tools to agents.