Add course schedules for ISF and ITZS programs for 2026 and 2024 sessions

- Created new snapshot files for ISF credits and daily schedules for the 26-АРХ and 26-ПГС programs.
- Added summer 2026 and winter 2024 exam schedules for the 23-ИТзс program, detailing lectures, labs, and consultations.

server/directory.js

@@ -1,6 +1,7 @@
 // University-wide directory: every catalog document parsed once and searched
 // by teacher, room and date. Answers come from the Word files only, so every
 // response carries its coverage and the caller must present it as such.
+import { catalogDiagnostics } from "./diagnostics.js";
 import { getCatalog, getCalendar } from "./source.js";
 import { scheduleFor } from "./schedules.js";
 import {
@@ -188,6 +189,8 @@ export const indexStatus = () =>
         failed: index.failed.length,
         builtAt: index.builtAt,
         rebuilding: Boolean(building),
+        // Cells that look misread, listed by /api/diagnostics.
+        problems: catalogDiagnostics(index).problems,
       }
     : { documents: 0, rebuilding: Boolean(building) };