[Fhatu12]

What changed

• Fix useStreaming so onComplete receives the latest completed assistant response.
• Handle the actual HanzoProvider stream contract: user messages followed by cumulative assistant snapshots.
• Prevent user-message inclusion and duplicated snapshot content.
• Preserve incremental onChunk delivery and stable callback identity.

Why

Previously, onComplete used stale currentMessage state and could return the previous response or an empty value.

The correction also ensures that cumulative assistant snapshots are not treated as independent text deltas.

How it was checked

• Focused tests: 9/9 PASS
• React package: 20/20 PASS
• Typecheck: PASS
• CJS/ESM/declaration build: PASS
• Focused formatting: PASS
• Real-provider mocked-SSE tests: PASS
• No live API calls used

Changes are limited to useStreaming and its focused regression tests. No dependency, provider, or public API changes.

Closes #308

[chatgpt-codex-connector]

Codex Review Summary: ✅ Completed

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-11T09:27:42.604747Z	ac030db	PR opened

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