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1eabbe905e
When a model returns no content, no structured reasoning, and no tool calls (common with open models), the agent now silently retries up to 3 times before falling through to (empty). Silent retry (no synthetic messages) keeps the conversation history clean, preserves prompt caching, and respects the no-synthetic-user- injection invariant. Most empty responses from open models are transient (provider hiccups, rate limits, sampling flukes) so a simple retry is sufficient. This fills the last gap in the empty-response recovery chain: 1. _last_content_with_tools fallback (prior tool turn had content) 2. Thinking-only prefill continuation (#5931 — structured reasoning) 3. Empty response silent retry (NEW — truly empty, no reasoning) 4. (empty) terminal (last resort after all retries exhausted) Inline <think> blocks are excluded — the model chose to reason, it just produced no visible text. That differs from truly empty. Tests: - Updated test_truly_empty to expect 4 API calls (1 + 3 retries) - Added test_truly_empty_response_succeeds_on_nudge