ffaeb8f37b
Closes brain-retro 2026-05-20 #8 — UserPromptSubmit hook injects <system-reminder>...</system-reminder> blocks into user.content that polluted classifyTask / classifyPromptSignal / routing detection. Now stripped via regex before any analysis. Completed by controller (Opus) after subagent hit context limit on 1250-line test file. Helper stripSystemReminders + promptText update were committed by subagent; test cases appended via Bash heredoc. 4 new vitest tests, 290/290 GREEN. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>