docs: update PRD with tuple-returning architecture and progress
- Updated section 4.1.2 with actual implementation details - All 35 prompt templates now return (prompt, parser) tuples - Added implementation progress table showing Phase 1 & 2 complete - Documented benefits of tuple-returning approach - Listed all updated functions and their parser types - Updated work items checklist to reflect completed phases - Added commit references:98554afc(architecture),5d1024e(templates) - Marked Phase 3 as next step: update prompt_calls.py files
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