feat(tags): Add --tag flag support to core commands for multi-context task management

- parse-prd now supports creating tasks in specific contexts
- Fixed tag preservation logic to prevent data loss
- analyze-complexity generates tag-specific reports
- Non-existent tags created automatically
- Enables rapid prototyping and parallel development workflows

.changeset/slow-lies-make.md

@@ -0,0 +1,5 @@
+---
+"task-master-ai": minor
+---
+
+No longer automatically creates individual task files as they are not used by the applicatoin. You can still generate them anytime using the `generate` command.