feat(layout): hierarchical auto-layout for draw.io diagrams#378
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Clean hierarchical layout algorithm with pinned element preservation and directional support. Isolated internal/layout package, good test coverage. Touches root.go — sequential merge needed.
Implements layout engine for automatic element positioning in draw.io diagrams. Changes: - internal/layout/types.go: Layout algorithm types and configuration - internal/layout/hierarchical.go: Hierarchical layout via longest-path algorithm - Layers elements based on outgoing relationships - Supports top-to-bottom (TB) and left-to-right (LR) ranking - Detects cycles and handles disconnected components - internal/layout/apply.go: Apply computed positions to draw.io XML - Respects pinned elements (bausteinsicht-pinned=true property) - Updates mxGeometry coordinates - internal/layout/hierarchical_test.go: 6 comprehensive tests - Layer assignment validation - Cycle handling (no infinite recursion) - RankDir variations - Edge cases (empty model, single element) - cmd/bausteinsicht/layout.go: CLI command - Usage: bausteinsicht layout [--rank-dir TB|LR] [--preserve-pinned] - Auto-detects model and diagram files - Reports applied layout Implementation Status: - ✅ Hierarchical layout (longest-path algorithm) - ⏳ Force-directed layout (future) - ⏳ Radial layout (future) Fixes #302 Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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Summary
Adds hierarchical layout engine for automatic element positioning in draw.io diagrams.
Changes:
bausteinsicht layout [--rank-dir TB|LR] [--preserve-pinned]Features:
Fixes #302
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