feat: Enterprise DSS architecture implementation

Complete implementation of enterprise design system validation:

Phase 1 - @dss/rules npm package:
- CLI with validate and init commands
- 16 rules across 5 categories (colors, spacing, typography, components, a11y)
- dss-ignore support (inline and next-line)
- Break-glass [dss-skip] for emergency merges
- CI workflow templates (Gitea, GitHub, GitLab)

Phase 2 - Metrics dashboard:
- FastAPI metrics API with SQLite storage
- Portfolio-wide metrics aggregation
- Project drill-down with file:line:column violations
- Trend charts and history tracking

Phase 3 - Local analysis cache:
- LocalAnalysisCache for offline-capable validation
- Mode detection (LOCAL/REMOTE/CI)
- Stale cache warnings with recommendations

Phase 4 - Project onboarding:
- dss-init command for project setup
- Creates ds.config.json, .dss/ folder structure
- Updates .gitignore and package.json scripts
- Optional CI workflow setup

Architecture decisions:
- No commit-back: CI uploads to dashboard, not git
- Three-tier: Dashboard (read-only) → CI (authoritative) → Local (advisory)
- Pull-based rules via npm for version control

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/dss-rules/rules/typography.json

@@ -10,15 +10,16 @@
     {
       "id": "use-typography-scale",
       "name": "Use Typography Scale",
-      "description": "Font sizes must use the defined typography scale",
+      "description": "Font sizes must use the defined typography scale tokens",
       "severity": "error",
       "patterns": {
         "forbidden": [
           "font-size:\\s*[0-9]+px",
-          "fontSize:\\s*[0-9]+"
+          "fontSize:\\s*[0-9]+",
+          "fontSize:\\s*'[0-9]+px'"
         ],
         "allowed": [
-          "var\\(--font-size-[a-z]+\\)",
+          "var\\(--font-size-[a-z0-9]+\\)",
           "\\$font-size-[a-z]+",
           "typography\\.[a-z]+"
         ]
@@ -36,26 +37,25 @@
       }
     },
     {
-      "id": "line-height-consistency",
-      "name": "Consistent Line Heights",
-      "description": "Line heights should match the typography scale",
-      "severity": "info",
-      "guidelines": [
-        "Use lineHeight.tight (1.25) for headings",
-        "Use lineHeight.normal (1.5) for body text",
-        "Use lineHeight.relaxed (1.75) for long-form content"
-      ]
+      "id": "no-font-family-override",
+      "name": "No Font Family Override",
+      "description": "Font families should use design system tokens",
+      "severity": "warning",
+      "patterns": {
+        "forbidden": [
+          "font-family:\\s*['\"][^'\"]+['\"]",
+          "fontFamily:\\s*['\"][^'\"]+['\"]"
+        ],
+        "allowed": [
+          "var\\(--font-[a-z]+\\)",
+          "\\$font-[a-z]+",
+          "fonts\\.[a-z]+"
+        ]
+      }
     }
   ],
   "tokens": {
-    "required": [
-      "typography.h1",
-      "typography.h2",
-      "typography.h3",
-      "typography.body",
-      "typography.small",
-      "typography.caption"
-    ],
+    "required": ["typography.h1", "typography.h2", "typography.h3", "typography.body", "typography.small"],
     "scale": {
       "xs": "12px",
       "sm": "14px",
@@ -64,12 +64,7 @@
       "xl": "20px",
       "2xl": "24px",
       "3xl": "30px",
-      "4xl": "36px",
-      "5xl": "48px"
-    },
-    "fontFamilies": {
-      "sans": "Inter, system-ui, sans-serif",
-      "mono": "JetBrains Mono, monospace"
+      "4xl": "36px"
     }
   }
 }