Initial TrueGrowth source import

openspec/changes/add-local-image-provider/specs/provider-routing/spec.md

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+## ADDED Requirements
+### Requirement: Route Local Image Models Through Basic OpenAI Image Binding
+The system SHALL route local OpenAI-compatible image models through the generic OpenAI image generation binding.
+
+#### Scenario: Local image model is selected
+- **GIVEN** a local provider profile exposes an image model from `/v1/models`
+- **WHEN** image bindings are inferred for that model
+- **THEN** the selected binding SHALL use protocol `openai.images.generations`
+- **AND** request schema `openai.image.basic-json`
+- **AND** submit path `/images/generations`
+
+### Requirement: Support No-Auth Provider Transport
+The system SHALL support provider profiles that intentionally send no authentication credentials.
+
+#### Scenario: Provider auth type is none
+- **GIVEN** a provider profile uses no authentication
+- **WHEN** a provider request is prepared
+- **THEN** the system SHALL NOT add Authorization, API key header, or API key query parameters