fix(#2414): honor ModelCreationContext.stream in OllamaChatModel [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]

[waterWang]

What

OllamaChatModel.doStream() previously ignored the streaming setting and always passed true to streamWithHttpClient(). When a caller creates the model with stream=false (via ModelCreationContext.stream) and consumes the result with blockLast(), they received empty content — the Ollama done marker carries no message.content.

Why it matters

• ModelCreationContext.stream is never consulted, so the per-call streaming preference is lost.
• Calling ollama:xxx with stream=false and blockLast() yields an empty response body.
• Behavior is inconsistent with the reference implementation (OpenAIChatModel) which honors the flag end-to-end.

Changes (4 touch points)

OllamaChatModel.java:

• Added instance field private boolean stream = true to preserve existing streaming default (backward compatible).
• Added setStream(boolean) setter (and isStream() getter) on the model.
• Added private boolean stream = true field to Builder plus a public Builder stream(boolean) method.
• Builder.build() now passes the flag to the model via model.setStream(stream).
• doStream(...) now dispatches on the effective stream value (instance field, overridable per-call via GenerateOptions.stream) instead of the hardcoded true.

OllamaModelProvider.java:

• applyAdvancedOptions(...) now reads context.getStream() and forwards it to builder.stream(...) when present.

Verification

• Existing streaming behavior is preserved (default is true).
• streamWithHttpClient(..., boolean stream) already handles both paths correctly; this fix only passes the correct boolean.
• Mirrors the approach used in OpenAIChatModel.

Closes #2414

[CLAassistant]

All committers have signed the CLA.

[jujn]

fixed in: #2415

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...scope/extensions/model/ollama/OllamaChatModel.java	54.54%	4 Missing and 1 partial ⚠️
...e/extensions/model/ollama/OllamaModelProvider.java	33.33%	1 Missing and 1 partial ⚠️

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