Phase 2 planning: schemas, roadmap, builder kit, research findings, migration plan

- HIGH_LEVEL_SCHEMA.md: 3-layer architecture (Edge/Git-Agent/Fleet), component mapping,
  modular install tiers (minimum/standard/fleet), git-native workflows, unified trust model
- ROADMAP.md: 12-sprint plan across 6 phases (2A-2F), task breakdowns per sprint,
  son's ecosystem integration priority, risk register
- BUILDER_SKILL_KIT.md: Builder profiles (power user/marine/fleet), technical reference
  (instruction format, opcodes, wire protocol, trust formula), sprint-by-sprint instructions,
  coding standards, testing strategy
- RESEARCH_FINDINGS.md: Synthesis of 4 parallel research agents covering Edge-Native
  (330 files, 1.1M words), git-agent (TypeScript, Cloudflare Workers), Lucineer ecosystem
  (99 repos), nexus-runtime audit (89 files, 11K LOC, 252 tests green)
- MIGRATION_PLAN.md: Phase-by-phase migration from edge-ref to nexus-runtime, priority
  matrix, reconciliation checklist, intentional exclusions

Author: NEXUS Bot