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Michael Suchacz
4f063cdc47
Admins can now control whether the built-in Coder Agents default system prompt is prepended to their custom instructions, rather than having the custom prompt silently replace the default. **Changes:** - New `include_default_system_prompt` boolean toggle (defaults to `true` for existing deployments) stored as a site config key — no migration needed. - GET `/api/experimental/chats/config/system-prompt` returns the toggle state, the custom prompt, and a preview of the built-in default. - PUT persists both the toggle and custom prompt atomically in a single transaction. - `resolvedChatSystemPrompt()` composes `[default?, custom?]` joined by `\n\n`, falling back to the built-in default on DB errors. - Settings UI adds a Switch toggle with conditional helper text and a "Preview" button that shows the built-in default prompt via the existing `TextPreviewDialog`. - Comprehensive test coverage: 15 subtests covering toggle behavior, prompt composition matrix, auth boundaries, and integration with chat creation.