Replace ReactFlow+ELK diagrams with Next.js+Graphviz and add CI auto-update

[anth-volk]

Summary

• Migrate pipeline diagrams from Vite+ReactFlow+ELK to Next.js+WASM Graphviz with DOT files as source of truth
• Add manifest.json as single source of truth for stages, titles, and Python source file mappings
• Add 3-phase CI workflow that uses Claude Code CLI agents to auto-update DOT diagrams when PRs change Python source files
• Add DOT style guide (CLAUDE.md) auto-loaded by CI agents

Closes #649

Test plan

• Next.js build passes (npx next build)
• Orchestrator tested locally against 86 changed files on main
• Phase 1 (stage list evaluation) correctly identifies unmapped files
• Phase 2 (per-stage DOT update) correctly maps files to stages and spawns agents
• Phase 3 (structural validation) path verified
• CI workflow runs successfully on a PR with Python changes
• Verify diagrams render correctly in deployed app

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
pipeline-diagrams	Ready	Preview, Comment	Apr 9, 2026 9:56pm