Archive roadmap and requirements to milestones/, evolve PROJECT.md
with validated requirements, update retrospective, and reorganize
ROADMAP.md with milestone groupings.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Archive v1.1 artifacts (roadmap, requirements, phases) to milestones/.
Evolve PROJECT.md with shipped requirements and new key decisions.
Reorganize ROADMAP.md with collapsed milestone groupings.
Update retrospective with v1.1 lessons.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
