- Wire secretsManager in NewHandler() — instantiate InfisicalBackend
when OIKOS_INFISICAL_SITE_URL is set (previously always nil)
- Add get_secret, list_secrets, set_secret MCP tools with nil-backend
graceful degradation
- Add oikos secret get|set|list CLI subcommands for Infisical
- Fix Set() bug: create-before-update so new keys are created;
add Type: "shared" to Update so it finds the right secret;
disable SDK cache so Get returns fresh data after Set
- Clean enrollment response: remove fake infisical_client_id/
infisical_client_secret stubs, store age key in Infisical for real