Add buffer and node cli actions

[Pajn]

Summary by CodeRabbit

• New Features

  • New CLI subcommands for buffer/location/history and node layout/zoom/break/join operations; new scripting actions (history, zoom/node ops, commit_search); search-mode bindings and bar-segment blink styling.

• Improvements

  • Stronger buffer/location validation, helper-buffer read-only protection, preserved activity/bell semantics, zoom-aware floating rendering, improved input-routing and config-reload behavior, and better PTY/test harness handling.

• Tests

  • Extensive unit, integration, interactive PTY and e2e test expansion; PTY-heavy tests serialized.

• Documentation

  • New/expanded API and design docs; updated in-page 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