fix(DIS-102): handle both slash styles for Windows path sanitization

os.homedir() returns backslashes on Windows but Claude Code outputs
paths with forward slashes. Replace both C:\Users\x and C:/Users/x
variants so home and repoRoot are always redacted.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/runtime/sanitize.ts

@@ -13,6 +13,17 @@ export interface SanitizeOptions {
  *   3. Discord bot token pattern → <redacted>
  *   4. Anthropic API key pattern → <redacted>
  */
+/** Returns both backslash and forward-slash variants of a path (for Windows). */
+function pathVariants(p: string): string[] {
+  const fwd = p.replace(/\\/g, "/");
+  const bwd = p.replace(/\//g, "\\");
+  return fwd === bwd ? [p] : [p, fwd, bwd];
+}
+
+function replaceAll(text: string, search: string, replacement: string): string {
+  return text.split(search).join(replacement);
+}
+
 export function sanitizeForDiscord(
   text: string,
   opts: SanitizeOptions = {}
@@ -22,12 +33,16 @@ export function sanitizeForDiscord(
   // 1. Replace repo root before home so that sub-paths are caught by the
   //    more specific substitution first (repoRoot is usually inside home).
   if (opts.repoRoot) {
-    result = result.split(opts.repoRoot).join("<disclaw>");
+    for (const variant of pathVariants(opts.repoRoot)) {
+      result = replaceAll(result, variant, "<disclaw>");
+    }
   }
 
-  // 2. Replace home directory with ~
+  // 2. Replace home directory with ~ (both slash styles for Windows)
   if (opts.home) {
-    result = result.split(opts.home).join("~");
+    for (const variant of pathVariants(opts.home)) {
+      result = replaceAll(result, variant, "~");
+    }
   }
 
   // 3. Discord bot token  — format: [MN]<23 base64url>.<6 base64url>.<27 base64url>