Agent loop, session management, tool execution, context compaction, hooks, and extensions.

DEPRECATED — maintenance mode only, superseded by the canonical ask-app-server + ask-session-protocol architecture and an internal successor. A self-hosted web coding agent for the ask-rb ecosystem. Runs Ask::Agent::Session against any workspace with a mobile-first PWA, streaming events over SSE, with approvals, plan mode, todos, and diffs. Comes with the `ach` utility CLI for headless runs and server management. Extensible to other coding agents (ACP, Codex, Claude Code) via ask-coding-providers.