feat(voyage): scaffold playground/ with DS vendor sync — v4.2 Step 5

- playground/voyage-playground.html: minimal skeleton (DOCTYPE, app-header, guide-panel, aria-live region, skip-to-main link). Steps 8-11 will extend with render-pipeline + creation gestures + sidebar + export.
- playground/vendor/playground-design-system/: synced via 'node scripts/sync-design-system.mjs voyage' (27 files + MANIFEST.json with source_commit + sync_date + SHA-256 per file).
- tests/playground/voyage-playground.test.mjs: 8 tests pinning HTML existence, DOCTYPE, no-external-URLs, no-marked, A11Y skip-to-main + aria-live, MANIFEST.json structure, vendored DS files present.
- shared/PLAYGROUND-MAINTENANCE.md: consumer list updated 5 -> 6 (added voyage).

playground/vendor/playground-design-system/schemas/okr-set.schema.json

@@ -0,0 +1,78 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://playground-ds.no/schemas/okr-set.json",
+  "title": "OKR-sett",
+  "description": "Et OKR-sett: ett mål (Objective) med 1–6 nøkkelresultater (KR). Brukes av OKR live-writer.",
+  "type": "object",
+  "required": ["id", "objective", "key_results", "owner", "period"],
+  "properties": {
+    "id": { "type": "string" },
+    "owner": {
+      "type": "object",
+      "required": ["name", "unit"],
+      "properties": {
+        "name": { "type": "string" },
+        "unit": { "type": "string", "description": "Avdeling/seksjon" },
+        "org":  { "type": "string", "description": "Kommune/etat" }
+      }
+    },
+    "period": {
+      "type": "object",
+      "required": ["kind", "label", "start", "end"],
+      "properties": {
+        "kind":  { "enum": ["tertial", "kvartal", "halvår", "år"] },
+        "label": { "type": "string", "description": "f.eks. 'T2 2026'" },
+        "start": { "type": "string", "format": "date" },
+        "end":   { "type": "string", "format": "date" }
+      }
+    },
+    "objective": {
+      "type": "object",
+      "required": ["text"],
+      "properties": {
+        "text": { "type": "string", "minLength": 10, "maxLength": 240 },
+        "rationale": { "type": "string" }
+      }
+    },
+    "key_results": {
+      "type": "array", "minItems": 1, "maxItems": 6,
+      "items": {
+        "type": "object",
+        "required": ["id", "text"],
+        "properties": {
+          "id":   { "type": "string", "pattern": "^KR[0-9]+$" },
+          "text": { "type": "string" },
+          "metric": {
+            "type": "object",
+            "properties": {
+              "name":     { "type": "string" },
+              "unit":     { "type": "string", "description": "%, dager, kr, antall, …" },
+              "baseline": { "type": "number" },
+              "target":   { "type": "number" },
+              "stretch":  { "type": "number" },
+              "source":   { "type": "string", "description": "KPI-katalog ref / Tableau-sett / etc." }
+            }
+          },
+          "deadline": { "type": "string", "format": "date" }
+        }
+      }
+    },
+    "score": {
+      "type": "object",
+      "description": "Generert av OKR-writer ved kvalitetsanalyse",
+      "properties": {
+        "overall":     { "type": "number", "minimum": 0, "maximum": 100 },
+        "measurability": { "type": "number" },
+        "specificity":   { "type": "number" },
+        "ambition":      { "type": "number" },
+        "actionability": { "type": "number" }
+      }
+    },
+    "critiques": {
+      "type": "array",
+      "items": { "$ref": "https://playground-ds.no/schemas/finding.json" }
+    },
+    "version": { "type": "string", "description": "Semver eller utkast 0.4-stil" },
+    "status":  { "enum": ["draft", "in-review", "approved", "active", "closed"], "default": "draft" }
+  }
+}