chore(voyage): bump version to 4.1.0 — modellprofiler + OTel-exporter ship

Step 23 of v4.1 — final version bump.

  package.json:               4.0.0 → 4.1.0
  .claude-plugin/plugin.json: 4.0.0 → 4.1.0

Verified ESM-friendly version-read:
  node -e "import('./package.json', {with: {type: 'json'}}).then(m =>
    console.log(m.default.version))" → 4.1.0

Grep verified no remaining "4.0.0" strings outside historical references
(CHANGELOG.md v4.0.0 section, MIGRATION.md v3→v4 migration prose,
.claude/ultraplan-sessions/ historical session notes — all expected).

Tests: 487 pass + 2 skipped (Docker not installed).

v4.1 SHIP-READY. Manual smoke (SC #14, #15, #17, #18) is the final
release-gate; documented in NEXT-SESSION-PROMPT.local.md.

plugins/voyage/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "voyage",
   "description": "Voyage — brief, research, plan, execute, review, continue. Contract-driven Claude Code pipeline.",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },