feat: dispatch crew-afk's claude coders through herdr for live pane visibility

Added

• crew-afk can dispatch claude-platform coders through herdr instead
  of headless -p, so a human can watch a dispatch live in a pane. Opt in with
  HERDR_ENABLED=1; it's a separate dispatch path (dispatchViaHerdr) that drives herdr's
  workspace create / agent start / agent prompt / agent read CLI rather than a flag on
  the existing headless dispatcher, since herdr's agents are long-lived interactive REPLs
  (idle/working/blocked/done/unknown), not one-shot batch runs. One workspace per dispatch,
  closed when it finishes. Handles the one-time workspace-trust dialog a fresh worktree can
  trip in interactive mode (-p always skips it; a pane doesn't) by detecting the known dialog
  text and answering it, treating any other blocked reason as a real failure. doctor/run
  preflight now also checks herdr is on PATH and its server is running when
  HERDR_ENABLED=1. pi/codex/copilot dispatch is unchanged.
  • registry.json: crew-afk 2.2.45 -> 2.2.46 (orchestrator/lib/dispatch.mjs,
    orchestrator/lib/effects.mjs, orchestrator/lib/pipeline.mjs, orchestrator/main.mjs).