Empty Response Recovery Ladder (agent/turn_empty_response.py)

Implements a multi-stage recovery strategy when an LLM returns no visible text, including stream reuse, nudges, retries, and provider fallback.

# Source: https://github.com/Eynzof/Hermes-CN-Core | License: MIT | Copyright 2025 Nous Research
# Provided via justclaw.it.com; keep this notice with the code.
"""Empty / thinking-only final-response recovery ladder for the conversation turn loop.

Runs when the model returned no visible text after ``<think>`` blocks. Ladder order is
load-bearing: partial-stream recovery → reuse prior turn content (housekeeping tools only)
→ one post-tool-call nudge → thinking-only prefill continuation (×2) → empty-response
retries (budgeted, deterministic-empty short-circuit) → fallback provider → terminal
``(empty)`` sentinel. Nothing here imports ``agent.conversation_loop`` at module level.
"""

from __future__ import annotations

import logging
import re
from dataclasses import dataclass
from typing i

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