chore: add changeset for Claude Code provider feature

.changeset/wet-berries-dress.md

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+---
+"task-master-ai": minor
+---
+
+Add Claude Code provider support
+
+Introduces a new provider that enables using Claude models (Opus and Sonnet) through the Claude Code CLI without requiring an API key. 
+
+Key features:
+- New claude-code provider with support for opus and sonnet models
+- No API key required - uses local Claude Code CLI installation
+- Optional dependency - won't affect users who don't need Claude Code
+- Lazy loading ensures the provider only loads when requested
+- Full integration with existing Task Master commands and workflows
+- Comprehensive test coverage for reliability
+- New --claude-code flag for the models command
+
+Users can now configure Claude Code models with:
+  task-master models --set-main sonnet --claude-code
+  task-master models --set-research opus --claude-code
+
+The @anthropic-ai/claude-code package is optional and won't be installed unless explicitly needed.