Add document converter, seeder data structure, and project wiki

- ai-service/convert.py: converts Office/PDF files to markdown with frontmatter
- database/seeders/data/: folder structure for themas, projects, documents, etc.
- database/seeders/data/raw/: drop zone for Office/PDF files to convert
- wiki/: project architecture, concepts, and knowledge graph documentation
- Remove unused Laravel example tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -43,6 +43,22 @@ All agent definitions are in `.claude/agents/`:
 - Basic AI chat + project summaries + semantic search
 - Dashboard with personal overview
 
+## Wiki (Knowledge Base)
+
+The project wiki lives in `wiki/` and follows the wiki-template schema. It is the canonical knowledge base for agents.
+
+**Quick access:**
+- `python wiki/tools/query.py health` — project health overview
+- `python wiki/tools/query.py entity "project"` — everything about an entity
+- `python wiki/tools/query.py test "phpunit"` — test results
+- `python wiki/tools/query.py status "proven"` — all pages with status
+- `bash wiki/tools/search.sh "keyword"` — full-text search
+- `bash wiki/tools/lint.sh` — check wiki health (orphans, missing frontmatter)
+
+**Source of truth hierarchy:** test results > code > knowledge-graph.yaml > wiki pages > chat
+
+**After making significant changes:** update relevant wiki pages, `knowledge-graph.yaml`, and `wiki/log.md`.
+
 ## What Requires Human Validation
 - Architecture decisions
 - Domain model changes