Extended Thinking Simplification

What: Streamlined from multilingual multi-level system to single trigger

Previous (v1.0.128):

• 8 languages supported (English, Japanese, Chinese, Spanish, French, German, Korean, Italian)
• 4 thinking levels: HIGHEST (31,999 tokens), MIDDLE (10,000), BASIC (4,000), NONE (0)
• Dozens of trigger phrases per language
• Complex pattern matching with negation filtering

Now (v2.0.0):

• English-only "ultrathink" trigger
• 2 levels: ULTRATHINK (31,999 tokens) or NONE (0)
• Simple case-insensitive regex matching
• New thinkingMetadata API for programmatic control

Implications:

• More predictable behavior
• Easier to remember single trigger word
• Programmatic control via metadata for advanced use cases
• Evidence: Removed v19 patterns at line 363665 in v1.0.128, new simplified system with NU1 at line 363628 and functions at lines 363644-363671 in v2.0.0