refactor: extract web content core package (#88346)

Extract web-content shared runtime helpers into packages/web-content-core, move the focused tests with the new package, and split quiet CI shards so the node matrix no longer stalls past the no-output watchdog.\n\nVerification: node scripts/run-vitest.mjs test/scripts/ci-node-test-plan.test.ts test/scripts/run-vitest.test.ts src/infra/restart.test.ts src/infra/os-summary.test.ts src/infra/gateway-processes.test.ts src/infra/inline-option-token.test.ts src/infra/map-size.test.ts src/infra/machine-name.test.ts src/commands/doctor-whatsapp-responsiveness.test.ts; autoreview clean; manual CI https://github.com/openclaw/openclaw/actions/runs/26693962844; dependency guard https://github.com/openclaw/openclaw/actions/runs/26693959937. Admin merge used because optional Mantis Telegram Desktop proof was cancelled after blocking merge outside this PR's required proof.

tsdown.config.ts

@@ -448,6 +448,13 @@ function buildTerminalCoreDistEntries(): Record<string, string> {
   };
 }
 
+function buildWebContentCoreDistEntries(): Record<string, string> {
+  return {
+    index: "packages/web-content-core/src/index.ts",
+    "provider-runtime-shared": "packages/web-content-core/src/provider-runtime-shared.ts",
+  };
+}
+
 function buildSpeechCoreDistEntries(): Record<string, string> {
   return {
     api: "packages/speech-core/api.ts",
@@ -647,6 +654,12 @@ export default defineConfig([
       neverBundle: shouldExternalizeTerminalCoreDependency,
     },
   }),
+  nodeWorkspacePackageBuildConfig({
+    clean: true,
+    dts: RUN_NODE_SKIP_DTS_BUILD ? false : undefined,
+    entry: buildWebContentCoreDistEntries(),
+    outDir: "packages/web-content-core/dist",
+  }),
   nodeWorkspacePackageBuildConfig({
     clean: true,
     dts: RUN_NODE_SKIP_DTS_BUILD ? false : undefined,