chore(git): ignore the logs folder functions:serve writes

The restored V1 logger creates logs/info.log and logs/error.log in whatever
directory serve runs from. Run from the repo root, that left an untracked
folder behind; one test was already doing so before it was given a temp dir.

#claude_code#
🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: naeem-shakh-cs

.gitignore

@@ -21,3 +21,6 @@ coverage/
 
 # Holds a registry auth token. Never commit it.
 .npmrc
+
+# Written by functions:serve into the project directory, as V1 did.
+logs/