Per-operation prompt customization

Prompt assembly is handled by src/utils/promptLoader.ts (v3). For each operation directory (e.g., contexts/Mutation.createCourse), the loader concatenates sources in this generic → specific order:

1. Settings: extraPrompt (or userGuidance)
2. Settings (type): extraPrompt{Query|Mutation|Subscription}
3. Settings file: extraPromptFile
4. Workspace: .appsync-testgen/prompt.md
5. Workspace (type): .appsync-testgen/prompt.<type>.md
6. Contexts: contexts/_prompts/prompt.md
7. Contexts (type): contexts/_prompts/prompt.<type>.md
8. Settings: perOperationPrompts[] (supports * wildcard on op)
9. Workspace per-op: .appsync-testgen/operations/<Parent>.<field>.md
10. Contexts per-op: contexts/_prompts/operations/<Parent>.<field>.md
11. Per-op file in op folder: <opDir>/gen.prompt.md

Tip: Prefer small, focused files per operation for strict guidance, and keep global guidance light.

Examples

// settings.json
{
  "appsyncTestGen.generation.perOperationPrompts": [
    { "op": "Mutation.create*", "prompt": "When validating, remove a required string field." },
    { "op": "Query.get*", "file": ".appsync-testgen/prompt.query.md" }
  ]
}

Create contexts/_prompts/operations/Mutation.createCourse.md to target a single operation.