fix(firmware-info): используй UTC+3 в именах папок

Переведи только время имени архива в UTC+3, сохрани UTC в метаданных и заголовке. Проверь переход на следующий день и копирование текущей папки.

c/firmware-info/tests/test_identity_archive.py

@@ -26,7 +26,7 @@ class ArchiveTests(unittest.TestCase):
             metadata.write_text(json.dumps(self.metadata()), encoding="utf-8")
             result = archive_build(image, metadata, root / "out")
             folder = Path(result["directory"])
-            self.assertEqual(folder.name, "a1b2c3d4_2026-10-08_12-30-00_UTC")
+            self.assertEqual(folder.name, "a1b2c3d4_2026-10-08_15-30-00_UTC+3")
             self.assertEqual((folder / image.name).read_bytes(), payload)
             self.assertEqual(image.read_bytes(), payload)
             self.assertEqual(json.loads((folder / "firmware_identity.json").read_text()), self.metadata())
@@ -60,7 +60,7 @@ class ArchiveTests(unittest.TestCase):
             result = archive_build(image, metadata, root / "local", export=root / "exported")
             copied = Path(result["exported_directory"])
             self.assertEqual([p.name for p in (root / "exported").iterdir()],
-                             ["a1b2c3d4_2026-10-08_12-30-00_UTC"])
+                             ["a1b2c3d4_2026-10-08_15-30-00_UTC+3"])
             self.assertEqual((copied / image.name).read_bytes(), image.read_bytes())
             self.assertTrue((copied / "firmware_identity.json").is_file())
             self.assertTrue((copied / (image.name + ".sha256")).is_file())
@@ -83,15 +83,19 @@ class ArchiveTests(unittest.TestCase):
             self.assertEqual((old / "keep.txt").read_text(), "keep")
             with self.assertRaises(ValueError):
                 export_build(folder, folder / "recursive", image.name)
-    def test_offset_normalizes_to_utc_and_dirty_is_visible(self):
+    def test_offset_normalizes_to_utc_plus_three_and_dirty_is_visible(self):
         metadata = self.metadata("2026-10-08T15:30:00+03:00")
         metadata["source"]["dirty"] = True
-        self.assertEqual(build_folder_name(metadata), "a1b2c3d4+_2026-10-08_12-30-00_UTC")
+        self.assertEqual(build_folder_name(metadata), "a1b2c3d4+_2026-10-08_15-30-00_UTC+3")
 
+    def test_folder_date_rolls_over_at_utc_plus_three_midnight(self):
+        metadata = self.metadata("2026-10-08T22:30:00+00:00")
+        self.assertEqual(build_folder_name(metadata), "a1b2c3d4_2026-10-09_01-30-00_UTC+3")
+        self.assertEqual(metadata["built_at_utc"], "2026-10-08T22:30:00+00:00")
     def test_archive_without_git_has_explicit_placeholder(self):
         metadata = self.metadata()
         metadata["source"]["commit"] = None
-        self.assertEqual(build_folder_name(metadata), "NOGIT000_2026-10-08_12-30-00_UTC")
+        self.assertEqual(build_folder_name(metadata), "NOGIT000_2026-10-08_15-30-00_UTC+3")
 
     def test_invalid_provenance_cannot_be_a_folder_name(self):
         metadata = self.metadata()

c/firmware-info/tools/identity.py

@@ -7,7 +7,7 @@ protocol encoding lives here: the generated header contains scalar constants.
 from __future__ import annotations
 
 import argparse
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 import hashlib
 import json
 import os
@@ -108,7 +108,7 @@ def verify(image: Path, manifest: Path) -> dict:
 
 
 def build_folder_name(metadata: dict) -> str:
-    """Use the firmware commit and pre-build UTC time, never post-build time."""
+    """Use the firmware commit and pre-build time rendered in UTC+3."""
     source = metadata.get("source") or {}
     dependency = metadata.get("templates") or {}
     commit = source.get("commit")
@@ -128,8 +128,8 @@ def build_folder_name(metadata: dict) -> str:
     stamp = datetime.fromisoformat(stamp_text.replace("Z", "+00:00"))
     if stamp.tzinfo is None:
         raise ValueError("pre-build timestamp must include a timezone")
-    stamp = stamp.astimezone(timezone.utc)
+    stamp = stamp.astimezone(timezone(timedelta(hours=3)))
-    return identity + "_" + stamp.strftime("%Y-%m-%d_%H-%M-%S_UTC")
+    return identity + "_" + stamp.strftime("%Y-%m-%d_%H-%M-%S_UTC+3")
 
 
 def export_build(folder: Path, export: Path, image_name: str) -> Path: