style: satisfy the black gate that was failing the Tests workflow

The Tests workflow was red on every OS and Python version for one reason:
`black --check` found 28 unformatted files. Part predates this branch (the
tui_v3 screens, core/api.py, core/index0.py); part is mine from this session.

Formatting only — verified rather than assumed, because a formatter touching
363 files is exactly where an unnoticed behaviour change would hide:

  - 1223 Python tests pass, unchanged
  - regenerating the fixtures after reformatting the generator produces
    byte-identical output, so no hashed value moved
  - differential fuzz: no divergences

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01Vtx94nXDmNgXEeThUZP4QN

src/tests/test_entropy_integrity.py

@@ -112,9 +112,7 @@ V1_VECTORS = [
 
 def _generator(policy: PasswordPolicy) -> PasswordGenerator:
     seed = Bip39SeedGenerator(TEST_MNEMONIC).Generate()
-    return PasswordGenerator(
-        _SeedDeriver(), TEST_MNEMONIC, BIP85(seed), policy=policy
-    )
+    return PasswordGenerator(_SeedDeriver(), TEST_MNEMONIC, BIP85(seed), policy=policy)
 
 
 # --------------------------------------------------------------------------
@@ -422,9 +420,7 @@ def test_entry_with_gen_version_2_derives_v2():
     pm = _manager_with(pg)
     entry = {"length": 16, "gen_version": CURRENT_PASSWORD_GEN_VERSION}
     got = PasswordManager._generate_password_for_entry(pm, entry, 3)
-    assert got == pg.generate_password(
-        16, 3, gen_version=CURRENT_PASSWORD_GEN_VERSION
-    )
+    assert got == pg.generate_password(16, 3, gen_version=CURRENT_PASSWORD_GEN_VERSION)
     assert got != pg.generate_password(16, 3, gen_version=1)