chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/coding-agent/docs/slash-commands.md

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+# Slash commands
+
+Type `/` in Pi's terminal editor to search the commands available in the current session. This page lists the built-in commands in the current Pi release.
+
+Extensions, prompt templates, and skills can add commands. The command menu in Pi is therefore the exact reference for the resources loaded in your session.
+
+## Models and settings
+
+| Command | Description |
+|---|---|
+| `/settings` | Open settings |
+| `/model [provider/model]` | Select a model |
+| `/thinking [level]` | Set the thinking level |
+| `/scoped-models` | Configure the models used by interactive cycling |
+| `/login [provider]` | Add provider authentication |
+| `/logout` | Remove provider authentication |
+| `/llama` | Manage models on the configured llama.cpp router |
+
+## Sessions and context
+
+| Command | Description |
+|---|---|
+| `/new` | Start a new session |
+| `/resume` | Switch to another saved session |
+| `/name [name]` | Set the session display name, or show the current name when omitted |
+| `/session` | Show current session information and statistics |
+| `/tree` | Navigate the session tree |
+| `/fork` | Create a new session from an earlier user message |
+| `/clone` | Duplicate the current session at its current position |
+| `/compact [instructions]` | Compact the current context, optionally with custom instructions |
+| `/import <path>` | Import and resume a JSONL session |
+
+## Export and share
+
+| Command | Description |
+|---|---|
+| `/copy` | Copy the last assistant message |
+| `/export [path]` | Export the session as HTML or JSONL |
+| `/share` | Upload the session and return a viewer link |
+| `/bug [description]` | Prepare a private bug report for the Pi developers |
+
+Review a session before exporting or sharing it. Sessions can contain prompts, tool arguments, command output, file contents, and credentials exposed during the conversation.
+
+## Runtime and project
+
+| Command | Description |
+|---|---|
+| `/trust` | Save a project trust decision for future Pi processes |
+| `/reload` | Reload keybindings, extensions, skills, templates, themes, and context files |
+| `/hotkeys` | Show active keyboard shortcuts |
+| `/changelog` | Show changelog entries |
+| `/quit` | Quit Pi |
+
+## Commands added by resources
+
+- Extensions can register commands with their own arguments and completion behavior.
+- Each prompt template is available under its template name.
+- Skills are available as `/skill:name` when skill commands are enabled.
+
+Use `/reload` after adding or changing a discovered command resource. See [Extensions](extensions.md), [Prompt Templates](prompt-templates.md), and [Skills](skills.md) for their loading and naming rules.