chore(state): tidy post-salvage residue in state.db durability test

Two leftovers from the #91852 descope (integrity-check tests removed but their
scaffolding stayed):

- Drop the now-unused `import pytest` (orphaned when the verify_state_db_integrity
  tests that used it were removed; no markers/raises/fixtures remain in this file).
- Rename the `# Defect 1:` section label to just `# Repair-path write durability`
  — the sibling "Defect 2" section was descoped out, leaving the numbering dangling.

Test-only, no behavior change. tests/test_state_db_write_durability.py: 4 passed.

tests/test_state_db_write_durability.py

@@ -34,8 +34,6 @@ import sqlite3
 import sys
 from pathlib import Path
 
-import pytest
-
 import hermes_state
 from hermes_state import (
     _connect_repair_durable,
@@ -55,7 +53,7 @@ def _make_db(tmp_path: Path) -> Path:
     return db
 
 
-# ── Defect 1: repair-path write durability ──────────────────────────────
+# ── Repair-path write durability ────────────────────────────────────────
 
 
 def test_connect_repair_durable_sets_macos_barriers(tmp_path: Path) -> None: