fix(skill): restructure tech-stack-evaluator with Progressive Disclosure (#64) (#120)

Restructure skill to follow Progressive Disclosure Architecture:

Structure Changes:
- Move Python scripts to scripts/ directory
- Move sample JSON files to assets/ directory
- Create references/ directory with extracted content
- Remove redundant HOW_TO_USE.md and README.md

New Reference Files:
- references/metrics.md: Detailed scoring algorithms and formulas
- references/examples.md: Concrete input/output examples
- references/workflows.md: Step-by-step evaluation workflows

SKILL.md Improvements:
- Reduced from 430 lines to ~180 lines
- Added table of contents
- Added trigger phrases in description
- Consistent imperative voice
- Points to references for details

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

engineering-team/tech-stack-evaluator/assets/sample_input_structured.json

@@ -0,0 +1,39 @@
+{
+  "comparison": {
+    "technologies": [
+      {
+        "name": "PostgreSQL",
+        "performance": {"score": 85},
+        "scalability": {"score": 90},
+        "developer_experience": {"score": 75},
+        "ecosystem": {"score": 95},
+        "learning_curve": {"score": 70},
+        "documentation": {"score": 90},
+        "community_support": {"score": 95},
+        "enterprise_readiness": {"score": 95}
+      },
+      {
+        "name": "MongoDB",
+        "performance": {"score": 80},
+        "scalability": {"score": 95},
+        "developer_experience": {"score": 85},
+        "ecosystem": {"score": 85},
+        "learning_curve": {"score": 80},
+        "documentation": {"score": 85},
+        "community_support": {"score": 85},
+        "enterprise_readiness": {"score": 75}
+      }
+    ],
+    "use_case": "SaaS application with complex queries",
+    "weights": {
+      "performance": 20,
+      "scalability": 20,
+      "developer_experience": 15,
+      "ecosystem": 15,
+      "learning_curve": 10,
+      "documentation": 10,
+      "community_support": 5,
+      "enterprise_readiness": 5
+    }
+  }
+}