Add support for AUTHENTIK_TOKEN_FILE environment variable fallback to
service_orchestrator.py, configure_vault_authentik.py, and the Rust
authentik_agent_manager CLI/MCP server. This prevents hardcoding or
exposing raw tokens in environment blocks or CLI arguments. Document
the new Authentik SSO stack deployment on cupfox k3s in AGENTS.md and
update .mcp.json.full configuration.
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