feat: session intelligence roadmap + design doc (#727) * docs: Session Intelligence Layer design doc Frames gstack as the persistent brain that survives Claude's ephemeral context window. Architecture diagram, 5-layer feature breakdown, and research sources from claude-mem, Anthropic engineering blog, CodeScene, and Claude Code Agent Teams. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: add context intelligence, health, swarm, and refactoring to roadmap 9 new TODOS across 4 sections based on Claude Code ecosystem research: - Context Intelligence (P1): preamble artifact recovery, session timeline, cross-session injection, /checkpoint skill, vision doc - Health (P1): /health dashboard with CodeScene MCP integration option, /health as /ship quality gate - Swarm (P2): extract Review Army into reusable multi-agent primitive - Refactoring (P2): /refactor-prep for pre-refactor token hygiene Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>