chore(deps-dev): bump dev-dependencies group with 4 updates

- @ai-sdk/provider 3.0.14 -> 3.0.15
- @opencode-ai/sdk 1.18.9 -> 1.18.18 (aligned with @opencode-ai/plugin
  1.18.18 from #93; the previous skew between the plugin's nested sdk
  copy and the root dev sdk broke CI on dependabot PR #98)
- @types/node 26.1.2 -> 26.2.0
- @types/semver 7.7.1 -> 7.8.0

Supersedes dependabot PR #98, which dependabot closed.

Author: justin-carper

package-lock.json

@@ -72,10 +72,10 @@
     "@ai-sdk/provider": "^3.0.0"
   },
   "devDependencies": {
-    "@ai-sdk/provider": "^3.0.13",
-    "@opencode-ai/sdk": "^1.18.4",
-    "@types/node": "^26.0.0",
-    "@types/semver": "^7.7.1",
+    "@ai-sdk/provider": "^3.0.15",
+    "@opencode-ai/sdk": "^1.18.18",
+    "@types/node": "^26.2.0",
+    "@types/semver": "^7.8.0",
     "tsup": "^8.5.1",
     "typescript": "^6.0.3",
     "vitest": "^4.1.8"