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/.claude-plugin/plugin.json

@@ -5,8 +5,8 @@
   "author": {
     "name": "Kjell Tore Guttormsen"
   },
-  "homepage": "https://git.fromaitochitta.com/open/ultraplan-local",
-  "repository": "https://git.fromaitochitta.com/open/ultraplan-local.git",
+  "homepage": "https://git.fromaitochitta.com/open/ktg-plugin-marketplace/src/branch/main/plugins/voyage",
+  "repository": "https://git.fromaitochitta.com/open/ktg-plugin-marketplace.git",
   "license": "MIT",
   "keywords": ["voyage", "trek", "planning", "implementation", "research", "context-engineering", "agents", "adversarial-review", "headless", "execution"]
 }