Initial commit: webtrees full diagram chart module

Interactive SVG family tree visualization using ELK (Sugiyama) for
layout and D3 for rendering. Shows ancestors, descendants, and siblings
in a single diagram with orthogonal bus-line connectors.

Features:
- Bidirectional tree traversal (ancestors + descendants + siblings)
- Generation-aligned layout with post-processing Y-snap
- Person cards with photos, names, dates, and hover bio cards
- "More ancestors" indicator for persons with hidden parents
- Pan/zoom navigation
- Docker dev environment

CLAUDE.md

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+# Full Diagram - webtrees Chart Module
+
+## Project Overview
+webtrees 2.2 chart module that visualizes the entire family tree (ancestors, descendants, siblings) in a single interactive SVG diagram. Inspired by MyHeritage "Family View".
+
+## Tech Stack
+- **PHP 8.2+** — webtrees 2.2 module (extends AbstractModule, implements ModuleChartInterface + ModuleCustomInterface)
+- **Namespace**: `FullDiagram\`
+- **D3.js v7** (cherry-picked: d3-hierarchy, d3-selection, d3-zoom, d3-shape, d3-transition) — SVG rendering
+- **Rollup** — JS bundling
+- **Docker Compose** — local dev (webtrees + MariaDB)
+
+## Key Conventions
+- PSR-4 autoloading: `FullDiagram\` → `src/`
+- Views in `resources/views/modules/full-diagram/`
+- JS source in `resources/js/modules/`, built to `resources/js/full-diagram.min.js`
+- CSS in `resources/css/full-diagram.css`
+- Route pattern: `/tree/{tree}/full-diagram/{xref}`
+
+## Development
+```bash
+# Start dev environment
+cd docker && docker compose up -d
+
+# JS development
+npm install && npm run watch
+
+# Build for release
+npm run prepare
+```
+
+## Architecture
+- `module.php` — entry point, autoloads namespace, returns Module instance
+- `src/Module.php` — route registration, request handling, view rendering
+- `src/Configuration.php` — generation limits, display toggles
+- `src/Facade/DataFacade.php` — bidirectional tree traversal (ancestors + descendants + siblings)
+- `src/Model/NodeData.php` — person data (JsonSerializable)
+- `src/Model/FamilyNode.php` — family unit: couple + children
+- JS uses dual d3.tree() layout: ancestors upward, descendants downward, stitched at root
+
+## Important Notes
+- webtrees uses `view()` helper for templates with `::` namespace syntax
+- Route registration uses `Registry::routeFactory()` in `boot()`
+- Access control via `Auth::checkComponentAccess()`
+- Individual data accessed via `$individual->facts()`, `childFamilies()`, `spouseFamilies()`