feat: Andritz Precision industrial design system

[Xuu-an]

Summary

• Replace generic design system with the Andritz "Monolithic Engine" industrial design system supporting dark/light theme variants
• 13 files changed (1652 additions, 971 deletions): SKILL.md, 8 reference docs, 1 new design philosophy doc, token starter JSON, 2 utility scripts, plan document
• Three-layer token architecture (primitive→semantic→component) with Material Design surface hierarchy, 0px radius industrial aesthetic, tonal layering, glassmorphic overlays, and complete Tailwind CSS integration

Key changes

• SKILL.md — rebranded to Andritz Design System v2.0.0
• references/design-philosophy.md — NEW: "The Monolithic Engine" creative north star
• references/primitive-tokens.md — Andritz Blue scale, surface hierarchy (light/dark), neutral, status colors
• references/semantic-tokens.md — Light :root and .dark theme tokens
• references/component-tokens.md — Button (gradient), Input (bottom-border), Card (no-line), Dialog (glassmorphic)
• references/component-specs.md — Industrial component specifications with anatomy diagrams
• references/states-and-variants.md — Tonal shifts, scale(0.98) active, ghost borders
• references/tailwind-integration.md — HSL variables, 0px radius overrides, shadcn/ui alignment
• references/token-architecture.md — Three-layer architecture with W3C DTCG format
• templates/design-tokens-starter.json — Complete W3C DTCG Andritz token starter
• scripts/fetch-background.py & scripts/html-token-validator.py — Updated with Andritz color values

Test plan

• JSON starter file validates successfully (python -c "import json; json.load(...)")
• No leftover generic tokens (#2563EB, gray-50: #F9FAFB) in reference files
• All Andritz color values consistent across files (verified primary=#0075be, surface=#f8fafb, etc.)
• Cross-references intact (component→semantic→primitive token chain)

🤖 Generated with Claude Code

[mrgoonie]

Cron-safe maintainer pass: deferring this PR from deep review because it is far outside the per-run PR budget.

Reason: metadata shows 100 changed files with +15,714 / -993, including generated/reference HTML screenshots, nested .claude/worktrees/agent-* paths, and a broad Andritz design-system replacement. It also overlaps a cluster of narrower open Andritz PRs (#248, #249, #252, #253, #254, #256, #320), so reviewing this monolithic version first would likely duplicate or bypass the split-review path.

Next step: please narrow this into source-of-truth PRs only, remove committed worktree artifacts and generated reference dumps unless they are explicitly required, and link which of the smaller Andritz PRs this supersedes. After that, the maintainer workflow can review a focused slice.

[ia-abatista]

Recommend closing, @mrgoonie. Andritz industrial design system rebrand plus ~70 demo-site preview files and stray worktree artifacts. Part of the off-scope Andritz series (#248-#256, #320).