wisp 0.28.0

Added:

• wisp threads lists the saved threads, chat's and every MCP agent's. wisp threads show ID gives one in full: its
  settings and instructions, turns, audit sessions, size on disk, and when the sweep deletes it.
  wisp threads delete ID removes a thread with its stored outputs. wisp threads hand ID CLIENT gives a thread to
  another client, so that client's agent can resume it. Delete and hand run only from a terminal, are refused while
  a process holds the thread, are audited as thread.deleted and thread.handed, and are refused to wisp's model
  by the default command policy. Each subcommand takes --json (ADR 0066, phase 3).
• /resume ID in chat saves the thread open now and opens another saved one in its place. An agent's thread keeps
  its own model, tools, and command limit. In wisp-tui, /threads is a picker that switches threads the same way.
• wisp doctor reports the thread store: how many threads are saved, which are open and who holds them, what the
  next sweep deletes, and any thread.json it cannot read.

Fixed:

• The thread store's sweep no longer deletes the stored outputs of a session another thread still uses. A chat's
  /new thread shares its session with the thread before it, and lost those outputs when that thread was swept.

Changed:

• An MCP agent refused another client's thread is told how the person can hand it over:
  wisp threads hand ID CLIENT.

Install or upgrade with Homebrew: brew install pidster/tap/wisp. Downloading the tarball directly leaves it quarantined; use Homebrew.