FEATURE: Add latest image model and aspect ratio support

[merefield]

No description provided.

[Copilot]

Pull request overview

Adds support for newer GPT image-generation models and introduces an aspect_ratio parameter to the Paint tool, while extending function schema/validation to support enum-constrained parameters across the plugin.

Changes:

• Add aspect_ratio enum parameter to PaintFunction and map aspect ratios to model-supported image sizes (DALL·E 3 vs GPT image family).
• Extend function parameter validation and function-to-JSON schema generation to support enum.
• Expand settings/model choices and update RAG tool availability to include paint edit for all gpt-image-* models; add specs covering these behaviors.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
spec/lib/functions/paint_function_spec.rb	New specs for aspect_ratio enum exposure and size mapping behavior per model family.
spec/lib/function_spec.rb	Adds validation tests for enum/type enforcement and ensures enum appears in parsed function JSON.
spec/lib/bot/open_ai_agent_spec.rb	Verifies paint_edit_picture tool inclusion for gpt-image-* models and exclusion for dall-e-3.
plugin.rb	Bumps plugin version to reflect feature release.
package.json	Bumps package version to match release increment.
lib/discourse_chatbot/functions/parser.rb	Emits enum into generated function JSON schema when present.
lib/discourse_chatbot/functions/paint_function.rb	Adds aspect ratio parameter, model-family size mapping, and broader GPT image model detection.
lib/discourse_chatbot/function.rb	Enhances parameter validation: unknown args, type checks, and enum constraint enforcement.
lib/discourse_chatbot/bots/open_ai_bot_rag.rb	Includes PaintEditFunction and enables it for any gpt-image-* configured model.
config/settings.yml	Adds gpt-image-1-mini and gpt-image-1.5 to picture creation model choices.
config/locales/server.en.yml	Updates setting/help text and adds translation for the new aspect_ratio parameter.

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