WithProvider and WithModel were option funcs passed into Agent(), conflating conversation-level config with agent selection. They are now first-class chain methods on the AI interface, consistent with WithContext.

Changes

• contracts/ai/ai.go — added WithProvider(string) AI and WithModel(string) AI to the AI interface
• contracts/ai/option.go — removed OptionProvider constant
• ai/application.go — added provider/model fields; implemented chain methods following the WithContext pattern
• ai/option.go — removed WithProvider/WithModel option funcs; WithTimeout remains as a per-agent option
• mocks/ai/AI.go — regenerated via go tool mockery

New API

conv, err := facades.AI().
    WithContext(ctx).
    WithProvider("openai").
    WithModel("gpt-4o").
    Agent(myAgent)

// Per-request timeout still via option
conv, err := facades.AI().
    WithContext(ctx).
    Agent(myAgent, ai.WithTimeout(30*time.Second))

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.