fix: resolve TypeScript compilation errors

Fixed 4 TypeScript errors:
- fs.ts: Removed duplicate 'os' import (lines 8 and 10)
- spec-regeneration.ts: Removed dead code checking for impossible error type (2 occurrences)

The error type checks were comparing msg.type to "error", but the SDK type union
does not include "error" as a valid message type. Errors are properly handled
in the catch blocks, so these checks were unreachable dead code.

All TypeScript compilation now passes cleanly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/server/src/routes/fs.ts

@@ -7,7 +7,6 @@ import { Router, type Request, type Response } from "express";
 import fs from "fs/promises";
 import os from "os";
 import path from "path";
-import os from "os";
 import { validatePath, addAllowedPath, isPathAllowed } from "../lib/security.js";
 import type { EventEmitter } from "../lib/events.js";
 

apps/server/src/routes/spec-regeneration.ts

@@ -355,9 +355,6 @@ Format your response as markdown. Be specific and actionable.`;
       } else if (msg.type === "result" && (msg as any).subtype === "success") {
         console.log("[SpecRegeneration] Received success result");
         responseText = (msg as any).result || responseText;
-      } else if (msg.type === "error") {
-        console.error("[SpecRegeneration] ❌ Received error message from stream:");
-        console.error("[SpecRegeneration] Error message:", JSON.stringify(msg, null, 2));
       }
     }
   } catch (streamError) {
@@ -505,9 +502,6 @@ Generate 5-15 features that build on each other logically.`;
       } else if (msg.type === "result" && (msg as any).subtype === "success") {
         console.log("[SpecRegeneration] Received success result for features");
         responseText = (msg as any).result || responseText;
-      } else if (msg.type === "error") {
-        console.error("[SpecRegeneration] ❌ Received error message from feature stream:");
-        console.error("[SpecRegeneration] Error message:", JSON.stringify(msg, null, 2));
       }
     }
   } catch (streamError) {