v1.15.0

What's Changed

• Validation: Fix Validator to require is_valid field (#2230)
• Gemini: Handle GEMINI_TOOLS in async streaming paths (#2135)
• CLI: Add --full-id flag to show complete batch IDs (#2068)
• Providers: Remove opinionated system prompt from JSON mode (#2069)
• Mode: Add missing GENAI and Responses modes to tool_modes() (#2072)
• xAI: Make xai-sdk optional at runtime (#2043, #2094)
• Docs: Add canonical OpenAI starter example (#2117)
• Deps: Bump dependencies (#2042)

Full diff: v1.14.5...v1.15.0