A large comment body was causing Regexp::TimeoutError in production.
The URI regexp isn't catastrophically backtracking — it's linear — but
with a long enough string it exceeds the 1s Regexp.timeout set by
Rails.
Skip scanning text nodes over 10KB, which is well beyond any
reasonable content for auto-linking and still keeps us many orders of
magnitued under the timeout on an unloaded machine.
Fixes FIZZY-Q4
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Mike Dalessio
87c659cd67