Add CHANGELOG.md for web-ui package

packages/web-ui/CHANGELOG.md

@@ -0,0 +1,83 @@
+# Changelog
+
+## [Unreleased]
+
+### Breaking Changes
+
+- **Agent class moved to `@mariozechner/pi-agent-core`**: The `Agent` class, `AgentState`, and related types are no longer exported from this package. Import them from `@mariozechner/pi-agent-core` instead.
+
+- **Transport abstraction removed**: `ProviderTransport`, `AppTransport`, `AgentTransport` interface, and related types have been removed. The `Agent` class now uses `streamFn` for custom streaming.
+
+- **`AppMessage` renamed to `AgentMessage`**: Now imported from `@mariozechner/pi-agent-core`. Custom message types use declaration merging on `CustomAgentMessages` interface.
+
+- **`UserMessageWithAttachments` is now a custom message type**: Has `role: "user-with-attachments"` instead of `role: "user"`. Use `isUserMessageWithAttachments()` type guard.
+
+- **`CustomMessages` interface removed**: Use declaration merging on `CustomAgentMessages` from `@mariozechner/pi-agent-core` instead.
+
+### Added
+
+- **`defaultConvertToLlm`**: Default message transformer that handles `UserMessageWithAttachments` and `ArtifactMessage`. Apps can extend this for custom message types.
+
+- **`convertAttachments`**: Utility to convert `Attachment[]` to LLM content blocks (images and extracted document text).
+
+- **`isUserMessageWithAttachments` / `isArtifactMessage`**: Type guard functions for custom message types.
+
+- **`createStreamFn`**: Creates a stream function with CORS proxy support. Reads proxy settings on each call for dynamic configuration.
+
+- **Default `streamFn` and `getApiKey`**: `AgentInterface` now sets sensible defaults if not provided:
+  - `streamFn`: Uses `createStreamFn` with proxy settings from storage
+  - `getApiKey`: Reads from `providerKeys` storage
+
+- **Proxy utilities exported**: `applyProxyIfNeeded`, `shouldUseProxyForProvider`, `isCorsError`, `createStreamFn`
+
+### Removed
+
+- `Agent` class (moved to `@mariozechner/pi-agent-core`)
+- `ProviderTransport` class
+- `AppTransport` class
+- `AgentTransport` interface
+- `AgentRunConfig` type
+- `ProxyAssistantMessageEvent` type
+
+### Migration Guide
+
+**Before (0.30.x):**
+```typescript
+import { Agent, ProviderTransport, type AppMessage } from '@mariozechner/pi-web-ui';
+
+const agent = new Agent({
+  transport: new ProviderTransport(),
+  messageTransformer: (messages: AppMessage[]) => messages.filter(...)
+});
+```
+
+**After:**
+```typescript
+import { Agent, type AgentMessage } from '@mariozechner/pi-agent-core';
+import { defaultConvertToLlm } from '@mariozechner/pi-web-ui';
+
+const agent = new Agent({
+  convertToLlm: (messages: AgentMessage[]) => {
+    // Extend defaultConvertToLlm for custom types
+    return defaultConvertToLlm(messages);
+  }
+});
+// AgentInterface will set streamFn and getApiKey defaults automatically
+```
+
+**Custom message types:**
+```typescript
+// Before: declaration merging on CustomMessages
+declare module "@mariozechner/pi-web-ui" {
+  interface CustomMessages {
+    "my-message": MyMessage;
+  }
+}
+
+// After: declaration merging on CustomAgentMessages
+declare module "@mariozechner/pi-agent-core" {
+  interface CustomAgentMessages {
+    "my-message": MyMessage;
+  }
+}
+```