feat: add tests

Author: 35C4n0r

lib/msgfmt/testdata/format/opencode/first_message/expected.txt

@@ -0,0 +1,12 @@
+                    █▀▀█ █▀▀█ █▀▀ █▀▀▄ █▀▀ █▀▀█ █▀▀▄ █▀▀
+                    █░░█ █░░█ █▀▀ █░░█ █░░ █░░█ █░░█ █▀▀
+                    ▀▀▀▀ █▀▀▀ ▀▀▀ ▀  ▀ ▀▀▀ ▀▀▀▀ ▀▀▀  ▀▀▀
+                                                  v0.6.8
+
+                     /new      new session     ctrl+x n
+                     /help     show help       ctrl+x h
+                     /share    share session   ctrl+x s
+                     /models   list models     ctrl+x m
+
+
+                    Grok Code is free for a limited time

lib/msgfmt/testdata/format/opencode/first_message/msg.txt

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+  ┃
+  ┃  Shell Check git remote URLs to identify repository
+  ┃
+  ┃  $ git remote -v
+  ┃  origin    https://github.com/35C4n0r/agentapi (fetch)
+  ┃  origin    https://github.com/35C4n0r/agentapi (push)
+  ┃  upstream    https://github.com/coder/agentapi.git (fetch)
+  ┃  upstream    https://github.com/coder/agentapi.git (push)
+  ┃
+
+
+     This is the 35C4n0r/agentapi repository, which is a fork of
+     coder/agentapi.
+     Build claude-sonnet-4-20250514 (09:19 PM)

lib/msgfmt/testdata/format/opencode/first_message/user.txt

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+Which repo is this ?

lib/msgfmt/testdata/format/opencode/second_message/expected.txt

@@ -0,0 +1,2 @@
+     Generating...
+     Build claude-sonnet-4-20250514 (09:23 PM)