* feat(lua): Add programmatic api for lua
* fix(lua): Resolve CI lint errors
- main.lua: drop duplicate `open_file_under_cursor` impl,
superseded by the path-resolving variant
- picker_ui.lua: replace undefined `canonicalize_fff_path`
with `utils.canonicalize_picker_path`
- programmatic_search_spec.lua: cast `hit` to non-nil after
the `assert.is_not_nil` so lua-ls stops flagging the
follow-up field accesses
Dmitriy Kovalenko
b5a7967fd2