Jump into a development shell:

    nix-shell

Then run  `help` to see the dev commands.

The source tree maps to the module namespace, and roughly follows the
Haskell namespace hierarchy (although nothing is enforced). The main
'common' space is `Biz`, other namespaces should be related to their
application.

Development aspects should be localized to their sub-namespaces as much
as possible. Only after sufficient iteration such that interfaces are
solidified and functionality is well-established should some code be
promoted up the namespace hierarchy. The one special namespace/directory
is `nix` which has all of our build rules.

Boundaries and interfaces between namespaces should be small and
well-defined. Likewise, the functionality and purpose of a particular
namespace should be small and well-defined. Following the unix principle
of "do one thing and do it well" is advised.

For building the code, we use `nix` and basically copy the namespace
hierarchy into the main build file `./default.nix`.

Namespaces are always capitalized. I would prefer always lowercase, but
`ghc` _really_ wants capitalized files, so we appeas `ghc`. In Scheme
this actually translates quite well and helps distinguish between types
and values.

File extensions denote _type_ and indicate to the build system how to
handle the file. So for example:

- `.hs` is Haskell source code, the build system compiles it
- `.scm` is Scheme source code, ditto
- `.org` is an organizational text document, the build system ignores
  this, but we use them to make plans and such
- `.jnl` is a journal for accounting, the build system will check our
  balances, make sure we're profitable