Optional, step-based setup for this connection. Call with no argument (or step 'step1') to offer the user setup, then advance in order: 'step2' to connect apps (uses `list_integrations` / `propose_connection`); 'step3' to ask what to save back to Unabyss; 'step4' with `context_preference` for the system prompt; then 'first-prompt' with `instructions_installed` to finish - it records setup as complete, unblocks every tool, and offers the user a first thing to run. Use 'completed' or 'skipped' only when the user stops early, and only after they explicitly choose - never decide that yourself (either way, future setup prompts stop on this connection). Skills are not part of the flow: only if the user asks for skills, 'step5' browses them and 'all-skills', 'essential-skills', or '<category>-skills' (e.g. 'sales-skills') list them with install instructions.