Move Cursor-specific duplicate text handling from auto-mode-service.ts
into CursorProvider.deduplicateTextBlocks() for cleaner separation.
This handles:
- Duplicate consecutive text blocks (same text twice in a row)
- Final accumulated text block (contains ALL previous text)
Also update REFACTORING-ANALYSIS.md with SpawnStrategy types for
future CLI providers (wsl, npx, direct, cmd).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
