Calls statifier a Hex dependency in two places

.github/workflows/ci.yml

@@ -44,7 +44,8 @@ jobs:
 
       # _build carries the Dialyzer PLT
       # (_build/dev/dialyxir_erlang-*_elixir-*_deps-dev.plt), so this cache is
-      # the PLT cache too. mix.lock pins the statifier git dep by SHA, so its
+      # the PLT cache too. statifier is a Hex dependency pinned in mix.lock by
+      # its exact version and checksum, so the lockfile's
       # hash moves whenever the engine moves. The restore-keys fallback means a
       # lockfile bump rebuilds the PLT incrementally from the previous one
       # rather than from scratch.

docs/architecture.md

@@ -59,8 +59,8 @@ capability to get started.
 ## What exists today
 
 As of this writing one thing is built and the rest is scaffold. The scaffold
-is the packaging: `mix.exs` declares the `statifier` dependency (a git
-dependency until statifier-ex publishes to hex) and the two optional
+is the packaging: `mix.exs` declares the `statifier` dependency (a Hex
+dependency pinned in `mix.lock`) and the two optional
 integrations, `kino` and `phoenix_live_view`, and `lib/statifier_ui.ex` is
 the top-level module with its `@moduledoc` and a `version/0` function.