fix: extract Gemma 4 <thought> reasoning in _extract_reasoning() (#8991)

Add <thought>(.*?)</thought> to inline_patterns so Gemma 4
reasoning content is captured for /reasoning display, not just
stripped from visible output.


Closes #8891

Co-authored-by: RhushabhVaghela <rhushabhvaghela@users.noreply.github.com>

run_agent.py

@@ -2018,6 +2018,7 @@ class AIAgent:
             inline_patterns = (
                 r"<think>(.*?)</think>",
                 r"<thinking>(.*?)</thinking>",
+                r"<thought>(.*?)</thought>",
                 r"<reasoning>(.*?)</reasoning>",
                 r"<REASONING_SCRATCHPAD>(.*?)</REASONING_SCRATCHPAD>",
             )