fix(workflow): prevent JSON parsing failures from LLM <think> blocks

[Sanjeever]

fix(workflow): remove think tags before JSON parsing

When parsing LLM responses, some replies include <think>...</think> tags (internal reasoning), which may break JSON parsing. This PR strips all <think>...</think> blocks via regex before attempting to parse, making JSON extraction stable.

What type of PR is this?

• fix

Check the PR title.

• This PR title match the format: (optional scope):
• The description of this PR title is user-oriented and clear enough for others to understand.
• Add documentation if the current PR requires user awareness at the usage level.

(Optional) Translate the PR title into Chinese.

fix(workflow): 在解析 JSON 前移除 think 标签

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en:

• Problem: Some LLM outputs wrap internal reasoning in <think>...</think>, causing JSON parsing to fail.
• Solution: Remove all <think>...</think> segments before JSON parsing using a regex pre-processing step.
• Impact: Improves robustness of JSON extraction; no functional change for valid JSON responses.

zh(optional):

• 问题：部分 LLM 输出包含 <think>...</think>，会导致 JSON 解析失败。
• 方案：在解析 JSON 前用正则移除所有 <think>...</think> 段落。
• 影响：提升 JSON 提取稳定性；对原本就合法的 JSON 输出无影响。

(Optional) Which issue(s) this PR fixes:

N/A

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}