v0.2.0 -> v0.3.0

Summary

Add multi-agent backend support (OpenAI, Claude, Gemini, Nvidia) with unified Agent interface architecture, complete filesystem toolchain, and interactive confirmation mechanism.

Changes

FEAT

• Add OpenAI Agent with API key authentication and gpt-5-nano default model
• Add Claude Agent with Anthropic Messages API integration and typed response deserialization
• Add Nvidia Agent with NIM API support and multiple model options
• Add Gemini Agent with Google Generative AI API and function calling protocol conversion
• Add search_content tool for regex-based file content searching
• Add run_command tool with command whitelist and safe rm via .Trash mechanism
• Add list_files, glob_files, write_file filesystem tools with directory exclusion
• Add interactive confirmation prompt before each tool call with --allow flag to bypass
• Add agent selection menu (GitHub Copilot, OpenAI, Claude, Gemini, Nvidia) at runtime
• Add .env support via godotenv for API key management

REFACTOR

• Restructure internal/client into internal/agents with unified Agent interface (Send + Execute)
• Extract Copilot implementation into dedicated internal/agents/copilot sub-package
• Extract shared execution loop into agents.Execute() with 128-iteration tool call limit
• Extract OpenAIToolCall as shared type for cross-agent response normalization
• Restructure Skill Scanner with concurrent goroutine scanning and SkillList indexing
• Refactor Claude agent from map[string]any response parsing to typed Output/Content structs
• Embed system prompt via //go:embed sysprompt.md

CHORE

• Add .env.example with OPENAI_API_KEY, ANTHROPIC_API_KEY, GEMINI_API_KEY, NVIDIA_API_KEY

REMOVE

• Remove legacy internal/client/copilot.go and internal/client/exec.go
• Remove internal/skill/skill.go (merged into scanner.go)

Files Changed

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