Preserve GPT-Control response polling state

[wolfiesch]

No description provided.

[Copilot]

🟢 Approval recommended

The change is small and well-tested, and it directly addresses the incorrect state transition that cleared awaitingAssistant without observing a new assistant turn.

Pull request overview

This PR fixes GPT-Control assistant polling so the driver preserves the “awaiting assistant response” state until a new assistant turn is actually observed, avoiding prematurely clearing the waiting flag when repeated polls still see the previous assistant message.

Changes:

• Introduces nextAssistantProgress to centralize and correctly compute assistant progress updates based on fingerprint changes.
• Refactors readAssistant to update persisted session metadata only when the assistant fingerprint changes (preserving awaitingAssistant across unchanged polls).
• Adds unit tests covering the key polling/progress transitions.

File summaries

File	Description
packages/gpt-control-driver/src/driver.ts	Adds nextAssistantProgress and updates readAssistant to avoid clearing awaitingAssistant unless the assistant fingerprint changes.
packages/gpt-control-driver/test/driver.test.ts	Adds focused unit tests validating nextAssistantProgress behavior for unchanged fingerprints, new turns, and baseline recording.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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