fix: move gitnexus-shared to devDependencies, use tsc for prepare

gitnexus-shared must remain available for tsc to resolve imports during
development/CI, but is not needed at runtime since it's bundled into
dist/_shared/. Moving it to devDependencies keeps it out of production
installs while allowing compilation. The prepare script now runs plain
tsc (no shared bundling needed for local dev).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

gitnexus/package-lock.json

@@ -16,7 +16,6 @@
         "commander": "^12.0.0",
         "cors": "^2.8.5",
         "express": "^4.19.2",
-        "gitnexus-shared": "file:../gitnexus-shared",
         "glob": "^11.0.0",
         "graphology": "^0.25.4",
         "graphology-indices": "^0.17.0",
@@ -50,6 +49,7 @@
         "@types/node": "^20.0.0",
         "@types/uuid": "^10.0.0",
         "@vitest/coverage-v8": "^4.0.18",
+        "gitnexus-shared": "file:../gitnexus-shared",
         "tsx": "^4.0.0",
         "typescript": "^5.4.5",
         "vitest": "^4.0.18"
@@ -65,6 +65,7 @@
     },
     "../gitnexus-shared": {
       "version": "1.0.0",
+      "dev": true,
       "devDependencies": {
         "typescript": "^6.0.2"
       }

gitnexus/package.json

@@ -46,7 +46,7 @@
     "test:integration": "vitest run test/integration",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
-    "prepare": "npm run build",
+    "prepare": "tsc",
     "prepack": "npm run build && chmod +x dist/cli/index.js"
   },
   "dependencies": {
@@ -86,6 +86,7 @@
     "tree-sitter-swift": "^0.6.0"
   },
   "devDependencies": {
+    "gitnexus-shared": "file:../gitnexus-shared",
     "@types/cli-progress": "^3.11.6",
     "@types/cors": "^2.8.17",
     "@types/express": "^4.17.21",