Add buffer and node cli actions

[Pajn]

Summary by CodeRabbit

• New Features

  • New CLI commands for buffer location/history and node layout (zoom/unzoom/toggle/swap/break/join/move) and matching scripting actions; search-mode commit/cancel bindings and bar-segment "blink" option.

• Improvements

  • Stronger validation and clearer CLI output for buffer/location/history operations; helper-buffer read-only protection; zoom-aware floating rendering; more robust config-reload and input-routing behavior; PTY/harness reliability fixes.

• Tests

  • Large expansion of unit, integration, interactive PTY and e2e tests; PTY-heavy tests serialized.

• Documentation

  • Expanded Action API, runtime/docs and design guides; updated mdBook search index asset.

• Chores

  • Workspace dependency and doctest configuration updates.

Stack

• api-docs Add api docs for rhai config #2 (merged)
• persistance Persist workspace state across clean restarts #3 (merged)
• buffer-cli Add native detached buffer CLI workflows #9 (merged)
• session-rename Add native session rename support #5 (merged)
• client-switch Add native client list detach and switch workflows #6
• pty-alive Keep PTY runtimes alive across server restarts #7
• → cli-tree Add buffer and node cli actions #8
• styling-gaps Add blink styling, italic support and rebindable search keys #10
• node-apis Add more node apis #11
• terminal-validation Test and document terminal handling #12