Initial TrueGrowth source import

openspec/changes/archive/2026-04-29-add-gpt-image-edit-support/specs/provider-routing/spec.md

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+## ADDED Requirements
+
+### Requirement: Prefer Image Request Schema Per Invocation
+
+The system SHALL allow an image invocation to prefer a request schema when multiple bindings exist for the same provider profile and model.
+
+#### Scenario: Prefer GPT Image edit schema
+
+- **GIVEN** a provider profile exposes both `openai.image.gpt-generation-json` and `openai.image.gpt-edit-form` for the same GPT Image model
+- **WHEN** the invocation asks for preferred request schema `openai.image.gpt-edit-form`
+- **THEN** the invocation plan SHALL select the edit binding
+
+#### Scenario: Fall back when preferred schema is unavailable
+
+- **GIVEN** a provider profile has only `openai.image.basic-json` for a GPT Image model
+- **WHEN** the invocation asks for preferred request schema `openai.image.gpt-edit-form`
+- **THEN** the invocation plan SHALL fall back to the available basic binding
+
+### Requirement: Add Official GPT Image Edit Binding
+
+The system SHALL infer an official GPT Image edit binding for provider profiles that resolve to official GPT Image compatibility.
+
+#### Scenario: Official GPT Image profile exposes edit binding
+
+- **GIVEN** a provider profile resolves image API compatibility to `openai-gpt-image`
+- **AND** the selected model is a GPT Image model
+- **WHEN** image bindings are inferred
+- **THEN** one binding SHALL use request schema `openai.image.gpt-edit-form`
+- **AND** submit path `/images/edits`
+- **AND** protocol `openai.images.edits`