fix(bedrock): wrap streamed text deltas in TextContent before updateContentBlock()

[campbellking]

Problem

src/Providers/AWS/HandleStream.php passes the raw delta string to StreamState::updateContentBlock(int $index, ContentBlockInterface $block):

if (isset($event['contentBlockDelta']['delta']['text'])) {
    $textChunk = $event['contentBlockDelta']['delta']['text'];
    $this->streamState->updateContentBlock($event['contentBlockDelta']['contentBlockIndex'], $textChunk);
    yield new TextChunk($this->streamState->messageId(), $textChunk);
}

Since declare(strict_types=1) was added to this file, this is a runtime TypeError on every Bedrock ConverseStream response that contains a text block — i.e. any streamed text completion via the Bedrock provider:

TypeError: StreamState::updateContentBlock(): Argument #2 ($block) must be of type ContentBlockInterface, string given

The adjacent reasoningContent branch already handles this correctly (wraps the delta in ReasoningContent before calling updateContentBlock); the text branch never got the same treatment.

Fix

Mirror the reasoning-branch pattern for text deltas by wrapping the chunk in TextContent.

Reproduction

Any stream() call through BedrockRuntime against a Converse-compatible model that returns text.

Context

We have carried this as a downstream composer patch since v3.3.10, where the same line produced a malformed content-block shape that dropped tool_use blocks; strict_types has since upgraded it from silent corruption to a hard crash. Happy to adjust style (e.g. import TextContent instead of the FQCN) if preferred.