…o, qwen, GLM)

Upstream commit d6785dc (PR NousResearch#8609):
- Fix empty response retry logic that blocked retries for reasoning models
  after prefill exhaustion. Models like mimo-v2-pro always populate reasoning
  fields via OpenRouter, so the old not _has_structured guard prevented
  retries for every reasoning model after prefill.
- Remove tool timing footer (upstream cleanup)
- Remove format_tool_timing_footer import
- Replace logger.debug with pass for non-critical failures
- 134 files changed, net -16K lines (mostly test/data cleanup)

Self-improve: automated upstream merge

…ousResearch#8609)

Three fixes for the (empty) response bug affecting open reasoning models:

1. Allow retries after prefill exhaustion — models like mimo-v2-pro always
   populate reasoning fields via OpenRouter, so the old 'not _has_structured'
   guard on the retry path blocked retries for EVERY reasoning model after
   the 2 prefill attempts.  Now: 2 prefills + 3 retries = 6 total attempts
   before (empty).

2. Reset prefill/retry counters on tool-call recovery — the counters
   accumulated across the entire conversation, never resetting during
   tool-calling turns.  A model cycling empty→prefill→tools→empty burned
   both prefill attempts and the third empty got zero recovery.  Now
   counters reset when prefill succeeds with tool calls.

3. Strip think blocks before _truly_empty check — inline <think> content
   made the string non-empty, skipping both retry paths.

Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models.
Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead
of proper function calls, causing content=None + tool_calls=None + reasoning
with embedded <tool_call> XML.  Prefill recovery works but counter
accumulation caused permanent (empty) in long sessions.

…ousResearch#8609)

Three fixes for the (empty) response bug affecting open reasoning models:

1. Allow retries after prefill exhaustion — models like mimo-v2-pro always
   populate reasoning fields via OpenRouter, so the old 'not _has_structured'
   guard on the retry path blocked retries for EVERY reasoning model after
   the 2 prefill attempts.  Now: 2 prefills + 3 retries = 6 total attempts
   before (empty).

2. Reset prefill/retry counters on tool-call recovery — the counters
   accumulated across the entire conversation, never resetting during
   tool-calling turns.  A model cycling empty→prefill→tools→empty burned
   both prefill attempts and the third empty got zero recovery.  Now
   counters reset when prefill succeeds with tool calls.

3. Strip think blocks before _truly_empty check — inline <think> content
   made the string non-empty, skipping both retry paths.

Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models.
Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead
of proper function calls, causing content=None + tool_calls=None + reasoning
with embedded <tool_call> XML.  Prefill recovery works but counter
accumulation caused permanent (empty) in long sessions.

…ousResearch#8609)

Three fixes for the (empty) response bug affecting open reasoning models:

1. Allow retries after prefill exhaustion — models like mimo-v2-pro always
   populate reasoning fields via OpenRouter, so the old 'not _has_structured'
   guard on the retry path blocked retries for EVERY reasoning model after
   the 2 prefill attempts.  Now: 2 prefills + 3 retries = 6 total attempts
   before (empty).

2. Reset prefill/retry counters on tool-call recovery — the counters
   accumulated across the entire conversation, never resetting during
   tool-calling turns.  A model cycling empty→prefill→tools→empty burned
   both prefill attempts and the third empty got zero recovery.  Now
   counters reset when prefill succeeds with tool calls.

3. Strip think blocks before _truly_empty check — inline <think> content
   made the string non-empty, skipping both retry paths.

Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models.
Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead
of proper function calls, causing content=None + tool_calls=None + reasoning
with embedded <tool_call> XML.  Prefill recovery works but counter
accumulation caused permanent (empty) in long sessions.

…ousResearch#8609)

Three fixes for the (empty) response bug affecting open reasoning models:

1. Allow retries after prefill exhaustion — models like mimo-v2-pro always
   populate reasoning fields via OpenRouter, so the old 'not _has_structured'
   guard on the retry path blocked retries for EVERY reasoning model after
   the 2 prefill attempts.  Now: 2 prefills + 3 retries = 6 total attempts
   before (empty).

2. Reset prefill/retry counters on tool-call recovery — the counters
   accumulated across the entire conversation, never resetting during
   tool-calling turns.  A model cycling empty→prefill→tools→empty burned
   both prefill attempts and the third empty got zero recovery.  Now
   counters reset when prefill succeeds with tool calls.

3. Strip think blocks before _truly_empty check — inline <think> content
   made the string non-empty, skipping both retry paths.

Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models.
Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead
of proper function calls, causing content=None + tool_calls=None + reasoning
with embedded <tool_call> XML.  Prefill recovery works but counter
accumulation caused permanent (empty) in long sessions.

…ousResearch#8609)

Three fixes for the (empty) response bug affecting open reasoning models:

1. Allow retries after prefill exhaustion — models like mimo-v2-pro always
   populate reasoning fields via OpenRouter, so the old 'not _has_structured'
   guard on the retry path blocked retries for EVERY reasoning model after
   the 2 prefill attempts.  Now: 2 prefills + 3 retries = 6 total attempts
   before (empty).

2. Reset prefill/retry counters on tool-call recovery — the counters
   accumulated across the entire conversation, never resetting during
   tool-calling turns.  A model cycling empty→prefill→tools→empty burned
   both prefill attempts and the third empty got zero recovery.  Now
   counters reset when prefill succeeds with tool calls.

3. Strip think blocks before _truly_empty check — inline <think> content
   made the string non-empty, skipping both retry paths.

Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models.
Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead
of proper function calls, causing content=None + tool_calls=None + reasoning
with embedded <tool_call> XML.  Prefill recovery works but counter
accumulation caused permanent (empty) in long sessions.