Save docs/IMPLEMENTATION_PLAN.md (the approved plan, with link paths
adjusted for its new home) so it survives across Claude Code sessions
and is visible to anyone cloning the project.
Add a docs/claude-scratch/ convention for ephemeral working docs
(kept as a folder via .gitkeep, contents gitignored) and ignore
.claude/settings.local.json (per-user harness config).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
