feat(git-workflow): Add automatic git branch-tag integration

- Implement automatic tag creation when switching to new git branches

- Add branch-tag mapping system for seamless context switching

- Enable auto-switch of task contexts based on current git branch

- Provide isolated task contexts per branch to prevent merge conflicts

- Add configuration support for enabling/disabling git workflow features

- Fix ES module compatibility issues in git-utils module

- Maintain zero migration impact with automatic 'master' tag creation

- Support parallel development with branch-specific task contexts

The git workflow system automatically detects branch changes and creates corresponding empty task tags, enabling developers to maintain separate task contexts for different features/branches while preventing task-related merge conflicts during collaborative development.

Resolves git workflow integration requirements for multi-context development.

.changeset/slick-webs-lead.md

@@ -0,0 +1,24 @@
+---
+"task-master-ai": minor
+---
+
+Research Save-to-File Feature & Critical MCP Tag Corruption Fix
+
+**🔬 New Research Save-to-File Functionality:**
+
+Added comprehensive save-to-file capability to the research command, enabling users to preserve research sessions for future reference and documentation.
+
+**CLI Integration:**
+- New `--save-file` flag for `task-master research` command
+- Consistent with existing `--save` and `--save-to` flags for intuitive usage
+- Interactive "Save to file" option in follow-up questions menu
+
+**MCP Integration:**
+- New `saveToFile` boolean parameter for the `research` MCP tool
+- Enables programmatic research saving for AI agents and integrated tools
+
+**File Management:**
+- Automatically creates `.taskmaster/docs/research/` directory structure
+- Generates timestamped, slugified filenames (e.g., `2025-01-13_what-is-typescript.md`)
+- Comprehensive Markdown format with metadata headers including query, timestamp, and context sources
+- Clean conversation history formatting without duplicate information