Add Email (IMAP/SMTP) and SSH Remote Access connectors
- CLAUDE.md: developer guide for the marketplace repo
- email/: generic IMAP+SMTP connector (stdlib only, config via env)
- env[] array, auth.type: password, verify.py (IMAP+SMTP probe)
- ssh/: SSH Remote Access connector ported from Skald, modified
- ALIASES_FILE → ~/.ssh_aliases.json (was ./secrets/...)
- optional env[] (TTL/timeout tunables)
- auth.type: none (per-alias auth at runtime via elicitation)
- tavily/: restructured with env[] (tavilyApiKey), verify.py, auth block
- connectors.json: added email, ssh, and tavily verify.py entries
- SKALD.md: documented env[], verify, password auth, SSH connector