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/rotten-files-clap.md

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+---
+"task-master-ai": minor
+---
+
+Add an experimental automatic git branch-tag integration for seamless multi-context development
+
+- **Automatic Tag Creation**: System now automatically creates empty tags when switching to new git branches
+- **Branch-Tag Mapping**: Maintains mapping between git branches and task contexts for seamless workflow
+- **Auto-Switch on Branch Change**: Task context automatically switches when you change git branches (when git workflow is enabled)
+- **Isolated Task Contexts**: Each branch gets its own clean task context, preventing merge conflicts and enabling parallel development
+- **Configuration Support**: Git workflow features can be enabled/disabled via `.taskmaster/config.json`
+- **Zero Migration Impact**: Existing projects continue working unchanged with automatic migration to "master" tag
+- **ES Module Compatibility**: Fixed git-utils module to work properly with ES module architecture

.changeset/slick-webs-lead.md

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+---
+"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