kimi-k2: fix p.chars() character class syntax
Fix `p.chars("0-9")` to `p.chars("[0-9]", 1, 10)` - the first argument
is a regex character class pattern, not a range string. Also specify
min/max repetitions (1-10 digits for tool call ID).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
