Endpoint operations: list, lifecycle, fork, digest, access.

The noun home for per-endpoint verbs (M8 decision 1). Bare spt endpoint renders the merged listing
— every member subnet's endpoints grouped by subnet, this session's own endpoint pinned distinctly
at the top.

Usage: spt endpoint [OPTIONS] [COMMAND]

Commands:
  list         Merged endpoint listing (the bare spt endpoint view)
  run          Bring up an spt-hosted harness endpoint into a broker-held PTY
  fork         Fork an endpoint into another subnet as a NEW identity
  suspend      Rest an endpoint cold (the suspend edge)
  wake         Wake a resting endpoint in place
  shutdown     Gracefully shut down an agent's own endpoint
  stop         Soft-stop a perch (spool preserved)
  rename       Rename an endpoint's logical id across its on-disk state
  purge        Permanently remove an endpoint and every record keyed on it
  digest       Show a session's live activity buffer (session digest)
  access       Endpoint access whitelist for unsolicited off-node inbound
  description  The endpoint's service-description blurb (ex-resources)
  role         Show or set the endpoint's durable role — a broad statement of purpose stored in
               the mind (tracked/agents/<id>/live-role.md), which replicates with the agent and
               renders FIRST at start-transition context injection. Bare role prints the current
               role; --overwrite <file> replaces it from a file. This is the sole writer of
               the role — no automated path (reconcile / echo-commune / signoff) ever mutates it
  help         Print this message or the help of the given subcommand(s)

Options:
      --json
          Emit machine-readable JSON instead of the human view. Honored by the read/status commands
          (list, whoami, status, description, role, the *-list queries, how-to); action commands
          ignore it

  -h, --help
          Print help (see a summary with '-h')