pi v0.84.3: Windows PowerShell tool, atomic managed updates, /thinking selector

v0.84.3 is a Windows-forward release. An optional native powershell tool lets the agent run PowerShell commands directly on Windows instead of routing everything through a POSIX-flavored shell; it is a built-in tool, selectable through defaultTools or the SDK. Windows and WSL keybinding defaults were also reworked to stop colliding with shortcuts terminals reserve for themselves — image paste, model cycling, editor undo, fullscreen navigation and message queueing all move.

Installer-managed installations get safer updates: pi update now stages the selected release, verifies it, and activates it atomically in place, so an interrupted update can no longer leave a half-written installation behind.

Model and thinking controls move up a notch: the /thinking selector gains searchable default choices, selections stay session-scoped unless you persist them explicitly with Ctrl+S, and that keybinding also saves a model as the global default. One breaking change for extension and library consumers — the inherited GoogleThinkingLevel type is renamed to GoogleApiThinkingLevel, with a normalized ResolvedGoogleThinkingLevel added alongside.

This is also the startup-time release: a bundled Node.js runtime loads jiti only when an extension is imported and Babel only for uncached transforms, syntax highlighting initializes twenty common languages eagerly and defers the rest, and the CLI and RPC entrypoints load a bundled runtime. Provider-wise, xAI switches to the Responses API with encrypted reasoning replay and Grok 4.6 as the default, China-specific ZAI Coding Plan models gain GLM-4.6V vision support, OpenAI-compatible servers such as vLLM, Qwen/SGLang, and llama.cpp expose configurable thinking-token budgets, and a session_compact_failed event reports compaction failures to extension handlers. The complete changelog is on the GitHub release page.