fix(start-work): preserve non-ASCII characters in plan name normalization

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/start-work/context-info-builder.ts

@@ -23,7 +23,7 @@ function normalizePlanLookupValue(value: string): string {
     .replace(/^["'`]+|["'`]+$/g, "")
     .toLowerCase()
     .replace(/[\s_]+/g, "-")
-    .replace(/[^a-z0-9-]+/g, "-")
+    .replace(/[^\p{L}\p{N}-]+/gu, "-")
     .replace(/-+/g, "-")
     .replace(/^-+|-+$/g, "")
 }