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Rework the implementation roadmap from parallelizable phases to a strict sequential order optimized for earliest usable increments. Key changes: - All 20 user stories in a single sequential queue (no parallelization) - Progress tracker at the top for status tracking - US-17 (dark mode) moved from Phase 5 to Increment 4 (before US-15) - US-14 (PWA) moved to last position - Deferred AC activation schedule added Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>