Persist Discord bot DAGs to disk for session recovery across restarts

Fix mypy errors in bot/, remove TYPE_CHECKING guard, run formatters

Add Discord bot as proper package, remove /bash slash command

Fix MenuSelect repeated text when terminal is narrower than content

Add billing header and remove extra blank lines in CLI output

Remove object.__setattr__ from frozen dataclasses

Move provider files into nano_agent/providers/ subdirectory

Reduce TYPE_CHECKING guards in executor, execution_context, and tools/base

Break circular import between data_structures.py and dag.py

Add prompt caching with cache_control breakpoints for Claude API

Add cost tracking, prompt caching, and fix token parsing bugs

Add theme switching, remove OSC 1337, clean up dead code, fix cursor management

Refactor footer with state machine, thread safety, and seamless transitions

Wrap long input lines instead of truncating with ellipsis

Truncate status bar to terminal width to prevent line wrapping