init: technical-visualization-haness 하네스 설계

examples/04-timeline/composition.json

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+{
+  "id": "retention-cycle",
+  "visual_grammar": "timeline",
+  "reader_question": "기준일과 현재·다음 로테이션의 시간 간격은 어떻게 되는가?",
+  "diagram_only": true,
+  "visible_text_scope": [
+    "node labels",
+    "boundary labels",
+    "edge labels",
+    "state/time annotations required to decode the relation"
+  ],
+  "forbidden_visible_elements": [
+    "global title",
+    "subtitle paragraph",
+    "footer",
+    "takeaway band",
+    "pattern number",
+    "generator watermark",
+    "decorative metric card",
+    "gradient",
+    "drop shadow",
+    "glow"
+  ],
+  "palette_policy": "grayscale plus one primary accent; status colors only when semantic",
+  "required_renderer_capabilities": [
+    "time axis",
+    "dated markers",
+    "period bracket"
+  ]
+}