Merge remote-tracking branch 'origin/master' into pr/cod-455-xlsx-preview

# Conflicts:
#	CLAUDE.md
#	src/web/public/styles.css

src/types/api.ts

@@ -157,6 +157,13 @@ export interface CaseInfo {
   location?: 'local' | 'linked-local' | 'remote' | 'docker';
   /** Whether this is a linked local folder */
   linked?: boolean;
+  /**
+   * The case folder did not answer (an unreachable network mount, or an error other
+   * than "no such file"), or its probe was refused because folders on other unreachable
+   * mounts are still not answering, so whether it still exists is unknown. A refused
+   * probe can set this on a healthy linked case. Absent = it answered.
+   */
+  unreachable?: boolean;
   /**
    * Present when Codeman scaffolded this case directory for an AGENT-spawned session
    * (the packaged skill's workers, or any spawn naming a parent session), read back