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/late-dryers-relax.md

@@ -0,0 +1,11 @@
+---
+"task-master-ai": minor
+---
+
+Add --tag flag support to core commands for multi-context task management. Commands like parse-prd, analyze-complexity, and others now support targeting specific task lists, enabling rapid prototyping and parallel development workflows.
+
+Key features:
+- parse-prd --tag=feature-name: Parse PRDs into separate task contexts on the fly
+- analyze-complexity --tag=branch: Generate tag-specific complexity reports  
+- All task operations can target specific contexts while preserving other lists
+- Non-existent tags are created automatically for seamless workflow

.changeset/slow-lies-make.md

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+---
+"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.