Enhance provider system with dynamic package resolution and improved logging

- Add npm registry lookup for AI SDK packages with fallback support
- Enhance error logging with cause information
- Add timing deltas to log output for performance monitoring

🤖 Generated with [opencode](https://opencode.ai)

Co-Authored-By: opencode <noreply@opencode.ai>

packages/opencode/src/provider/provider.ts

@@ -186,9 +186,8 @@ export namespace Provider {
       const s = await state()
       const existing = s.sdk.get(providerID)
       if (existing) return existing
-      const mod = await import(
-        await BunProc.install(`@ai-sdk/${providerID}`, "alpha")
-      )
+      const [pkg, version] = await ModelsDev.pkg(providerID)
+      const mod = await import(await BunProc.install(pkg, version))
       const fn = mod[Object.keys(mod).find((key) => key.startsWith("create"))!]
       const loaded = fn(s.providers[providerID]?.options)
       s.sdk.set(providerID, loaded)