feat: add comma-separated status filtering to list-tasks

- supports multiple statuses like 'blocked,deferred' with comprehensive test coverage and backward compatibility

- also adjusts biome.json to stop bitching about templating.

.changeset/tiny-ads-decide.md

@@ -0,0 +1,7 @@
+---
+"task-master-ai": minor
+---
+
+Adds support for filtering tasks by multiple statuses at once using comma-separated statuses.
+
+Example: `cancelled,deferred`