agents@0.19.0

### Minor Changes

-   [#1922](https://github.com/cloudflare/agents/pull/1922) [`cb4c1c7`](https://github.com/cloudflare/agents/commit/cb4c1c722d5a556ce68228d8e60f9c1df604ef81) Thanks [@cjol](https://github.com/cjol)! - Support both AI SDK v6 and v7.

      The `ai` peer range is `ai@^6 || ^7` (and `@ai-sdk/react` is `@^3 || ^4`) across
      `agents`, `@cloudflare/ai-chat`, `@cloudflare/codemode`, and `@cloudflare/think`.
      Consumers can adopt AI SDK v7 or stay on v6 — no forced AI SDK upgrade when
      bumping these packages.

      Only the current implementations are covered. New optimisations and APIs made
      available by AI SDK v7 (broader result-shape audits, stream helper migrations,
      etc.) are intentionally out of scope.

      How dual-version support works — `@cloudflare/think` calls the AI SDK through the
      option names present in both majors (v7 keeps the v6 names as aliases), and
      normalizes the genuine divergences at the boundary:

    -   Uses `stepCountIs`, `system`, `experimental_telemetry`, `onStepFinish`, and
        `experimental_onToolCallFinish` (in v7 this alias resolves to
        `onToolExecutionEnd` and fires once).

    -   The tool-execution-finished event is normalized across majors: v6's
        `{ success, output, error, durationMs, stepNumber }` and v7's
        `{ toolOutput, toolExecutionMs }` collapse to one `ToolCallResultContext`.
        `stepNumber` is `undefined` under v7 (the v7 event no longer provides it).

    -   The UI message stream is built via the result's `toUIMessageStream()` method
        (present in both majors); the standalone `toUIMessageStream({ stream })`
        helper and `result.stream` are v7-only.

    -   The workspace read tool emits `{ type: "file-data", data, mediaType, filename }`
            model output, accepted by both majors (v7's newer `{ type: "file", data: {
        type: "data", data } }` shape does not exist in v6).

          Public API notes:

    -   `@cloudflare/think` keeps `system`, `onStepFinish`, and `experimental_telemetry`
        where callers already use them, and also accepts `TurnConfig.telemetry`
        (forwarded ahead of `experimental_telemetry` when present).

    -   `@cloudflare/ai-chat` updates the `AIChatAgent.onChatMessage` callback type
          from `StreamTextOnFinishCallback` to `GenerateTextOnFinishCallback`.

        Verified against both `ai@6` and `ai@7`: `@cloudflare/think` type-checks with
        zero errors and its full workers test suite passes under each major.

        Known limitations:

    -   `workers-ai-provider` (Think's default model provider) is fixed at v4 for AI
        SDK v7. Consumers on `ai@6` who rely on Think's built-in default model may hit
        a provider-version mismatch; passing their own `LanguageModel` avoids this.

    -   `chat@4.31.0` currently declares an `ai@^6` peer and does not yet advertise
        v7 support; tracked separately.

    -   CI should exercise both an `ai@6` and an `ai@7` resolution to guard the matrix.

### Patch Changes

-   Updated dependencies \[[`cb4c1c7`](https://github.com/cloudflare/agents/commit/cb4c1c722d5a556ce68228d8e60f9c1df604ef81)]:
    -   @cloudflare/codemode@0.5.0