feat(voyage)!: marketplace handoff — rename plugins/ultraplan-local to plugins/voyage [skip-docs]

Session 5 of voyage-rebrand (V6). Operator-authorized cross-plugin scope.

- git mv plugins/ultraplan-local plugins/voyage (rename detected, history preserved)
- .claude-plugin/marketplace.json: voyage entry replaces ultraplan-local
- CLAUDE.md: voyage row in plugin list, voyage in design-system consumer list
- README.md: bulk rename ultra*-local commands -> trek* commands; ultraplan-local refs -> voyage; type discriminators (type: trekbrief/trekreview); session-title pattern (voyage:<command>:<slug>); v4.0.0 release-note paragraph
- plugins/voyage/.claude-plugin/plugin.json: homepage/repository URLs point to monorepo voyage path
- plugins/voyage/verify.sh: drop URL whitelist exception (no longer needed)

Closes voyage-rebrand. bash plugins/voyage/verify.sh PASS 7/7. npm test 361/361.

plugins/voyage/settings.json

@@ -0,0 +1,31 @@
+  {
+    "trekplan": {
+      "defaultMode": "default",
+      "autoResearch": true,
+      "interview": {
+        "maxQuestions": 8,
+        "typicalQuestions": 5
+      },
+      "tracking": {
+        "enabled": true,
+        "statsFile": "trekplan-stats.jsonl"
+      }
+    },
+    "trekresearch": {
+      "defaultMode": "default",
+      "maxDimensions": 8,
+      "geminiBridge": {
+        "enabled": true,
+        "pollIntervalSeconds": 30,
+        "timeoutMinutes": 25
+      },
+      "interview": {
+        "maxQuestions": 4,
+        "typicalQuestions": 3
+      },
+      "tracking": {
+        "enabled": true,
+        "statsFile": "trekresearch-stats.jsonl"
+      }
+    }
+  }