feat: customization hooks for ChatApp subclasses (#12)

fix: pass tool-output Markdown as Collapsible child arg (#11)

feat: render tool output as collapsible markdown (#10)

feat: conversation log + system prompt overrides (#9)

feat: library API for custom tools, commands, and model override (#8)

feat: add optional Langfuse observability integration (#7)

fix: address CodeRabbit review — escape guard and landing-info height

fix: prevent agent selection dialog from auto-closing + landing page tweaks

feat: thinking transparency layer with /verbose command

refactor: rename orchestrators to manager, add architecture boundary tests

refactor: remove specialists, schemas, dummy agent; extract model config

feat: add native agent tools, /tools command, and fix rendering bugs

feat: generalize agent orchestration and externalize prompts to YAML

functional testing

initial commit: modular textual tui with async agent loop