Maintenance workflows

Archived implementation plan — full original plan (goal, folder layout, quality gates) plus YAML metadata showing all todos completed. Use this if ~/.cursor/plans/ is missing on another machine.
docs/AI-KNOWLEDGE-BASE.md (local only, gitignored) — optional inventory for AI agents; not on the public docs site.
Docs visual enrichment workflow — scan, prioritize, generate, review, and link explanatory visuals across DSA sections.
Further improvements backlog — optional next steps: CI, spaced repetition, static site, runnable solutions, index sync, and more.
AI tooling roadmap — phased roadmap for AI/agents: CI, link checker, CONTRIBUTING, index diff, skills, docs site, optional runnable solutions.