docs(readme): rename Claude Code Integration to Agent Skill Integration

chore(skill): move skills to external repository

chore(deps): upgrade google.golang.org/grpc to v1.79.3

chore(deps): update direct and indirect dependencies

feat(cache): migrate API key helper cache to OS credential store (#264)

feat(credentials): add secure credential storage for API keys (#263)

fix(lint): resolve all 49 golangci-lint issues (#262)

chore(deps): upgrade direct and indirect dependencies

fix(openai): propagate write errors in streaming completion

fix(provider): handle write errors in streaming responses

refactor(openai): extract shared helpers and add streaming reasoning support

docs(readme): document streaming output option and usage

feat(core): add streaming output support for real-time token display (#261)

fix(cmd): use MkdirAll directly for prompt folder creation

fix(docker): create home directory for codegpt user in container (#260)