understand-domain

# /understand-domain Extracts business domain knowledge — domains, business flows, and process steps — from a codebase and produces an interactive horizontal flow graph in the dashboard. ## How It Works - If a knowledge graph already exists (`.understand-anything/knowledge-graph.json`), derives domain knowledge from it (cheap, no file scanning) - If no knowledge graph exists, performs a lightweight scan: file tree + entry point detection + sampled files - Use `--full` flag to force a fresh scan even if a knowledge graph exists ## Instructions ### Phase 0: Resolve `PROJECT_ROOT` Set `PROJECT_ROOT` to the current working directory. **Worktree redirect.** If `PROJECT_ROOT` is inside a git worktree (not the main checkout), redirect output to the main repository root. Worktrees managed by Claude Code are ephemeral — `.understand-anything/` written there is destroyed when the session ends, taking the domain graph with it (issue #133). Detect a worktree by comparing `git rev-parse --git-dir` against `git rev-parse --git-common-dir`; in a normal checkout or submodule they resolve to the same path, in a worktree they differ and the parent of `--git-common-dir` is the main repo root. ```bash COMMON_DIR=$(git -C "$PROJECT_ROOT" rev-parse --git-common-dir 2>/dev/null) GIT_DIR=$(git -C "$PROJECT_ROOT" rev-parse --git-dir 2>/dev/null) if [ -n "$COMMON_DIR" ] && [ -n "$GIT_DIR" ]; then COMMON_ABS=$(cd "$PROJECT_ROOT" && cd "$COMMON_DIR" 2>/dev/null && pwd -P) GIT_ABS=$(cd "$PROJ...