Address @claude review: format core/, typed output-validation error, document progress heuristic

- Run Prettier on the 60 core/ files this PR touched — the deterministic
  import rewrite had collapsed multi-line imports and left throws unwrapped;
  core/ is in no format gate so it slipped past CI. Now Prettier-clean.
- Default-path output-schema violation now throws
  ProtocolError(ProtocolErrorCode.InvalidParams, …) instead of a bare Error,
  matching the prior v1 contract (SDK threw a typed McpError with a code) so
  downstream `instanceof`/`.code` branching keeps working.
- Document the "assumes serial construction" invariant on pollTaskToolCall's
  progress-subscription revival (the `_progressHandlers` new-key heuristic).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/mcp/oauthManager.ts

@@ -286,8 +286,7 @@ export class OAuthManager {
     try {
       if (this.isEnterpriseManaged()) {
         const emaConfig = await this.getEmaFlowConfig();
-        const scopeForMint =
-          this.pendingAuthorizationScope ?? emaConfig.scope;
+        const scopeForMint = this.pendingAuthorizationScope ?? emaConfig.scope;
         const config = scopeForMint
           ? { ...emaConfig, scope: scopeForMint }
           : emaConfig;
@@ -449,7 +448,9 @@ export class OAuthManager {
    */
   async refreshEnterpriseManagedTokens(): Promise<boolean> {
     if (!this.isEnterpriseManaged()) return false;
-    const tokens = await refreshEmaResourceTokens(await this.getEmaFlowConfig());
+    const tokens = await refreshEmaResourceTokens(
+      await this.getEmaFlowConfig(),
+    );
     return tokens !== undefined;
   }