fix: normalize paths for cross-platform consistency in logging

- Use POSIX-style forward slashes in FILE_PATHS for consistent logging
- Normalize backslashes to forward slashes in update command output
- Improves Windows compatibility and log readability

src/core/configurators/slash/codex.ts

@@ -5,6 +5,7 @@ import { SlashCommandId, TemplateManager } from "../../templates/index.js";
 import { FileSystemUtils } from "../../../utils/file-system.js";
 import { OPENSPEC_MARKERS } from "../../config.js";
 
+// Use POSIX-style paths for consistent logging across platforms.
 const FILE_PATHS: Record<SlashCommandId, string> = {
   proposal: ".codex/prompts/openspec-proposal.md",
   apply: ".codex/prompts/openspec-apply.md",

src/core/update.ts

@@ -106,9 +106,9 @@ export class UpdateCommand {
     }
 
     if (updatedSlashFiles.length > 0) {
-      summaryParts.push(
-        `Updated slash commands: ${updatedSlashFiles.join(', ')}`
-      );
+      // Normalize to forward slashes for cross-platform log consistency
+      const normalized = updatedSlashFiles.map((p) => p.replace(/\\/g, '/'));
+      summaryParts.push(`Updated slash commands: ${normalized.join(', ')}`);
     }
 
     const failedItems = [