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.

test/snapshot.test.js

@@ -0,0 +1,44 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync, readdirSync, writeFileSync, existsSync, mkdirSync } from "node:fs";
+import { parseDocx } from "../server/parser.js";
+import { diagnose } from "../server/diagnostics.js";
+import { snapshotOf, diffLines } from "../scripts/snapshot-lines.js";
+
+// Every fixture parsed and compared line by line with test/snapshots/<name>.txt, together with
+// the cells diagnostics flags. After an intended parser change: UPDATE_SNAPSHOTS=1 npm test,
+// then read the diff of test/snapshots/ before committing it.
+const fixtures = new URL("./fixtures/", import.meta.url);
+const snapshots = new URL("./snapshots/", import.meta.url);
+const update = process.env.UPDATE_SNAPSHOTS === "1";
+// The bell schedule and the week table are calendar documents, not timetables.
+const calendars = new Set(["bells.docx", "weeks.docx"]);
+
+for (const file of readdirSync(fixtures).filter((f) => f.endsWith(".docx") && !calendars.has(f)).sort()) {
+  test(`снимок разбора: ${file}`, () => {
+    const meta = existsSync(new URL(`${file}.json`, fixtures))
+      ? JSON.parse(readFileSync(new URL(`${file}.json`, fixtures), "utf8"))
+      : {};
+    const schedule = parseDocx(readFileSync(new URL(file, fixtures)), {
+      name: meta.name || file,
+      modified: meta.modified,
+    });
+    const lines = [
+      ...snapshotOf(schedule),
+      ...diagnose(schedule).map((p) => `! ${p.code} | ${(p.raw || p.groups?.join(",") || "").replace(/\s+/g, " ")}`),
+    ];
+    const target = new URL(file.replace(/\.docx$/, ".txt"), snapshots);
+    if (update || !existsSync(target)) {
+      mkdirSync(snapshots, { recursive: true });
+      writeFileSync(target, lines.join("\n") + "\n");
+      return;
+    }
+    const saved = readFileSync(target, "utf8").trimEnd().split("\n");
+    const { removed, added } = diffLines(saved, lines);
+    assert.ok(
+      !removed.length && !added.length,
+      `Разбор ${file} изменился (UPDATE_SNAPSHOTS=1 npm test, если так и задумано):\n` +
+        [...removed.map((l) => `  − ${l}`), ...added.map((l) => `  + ${l}`)].join("\n"),
+    );
+  });
+}