style(1b): auto-format + lint-clean the whole codebase (RL1)

Mechanical, semantics-preserving cleanup so the codebase passes the new lint stage:
- ruff format: all 32 Python files (wraps long signatures, normalizes quotes/blank lines).
- nixpkgs-fmt: modules/drone-runner.nix.
- shfmt (-i 2 -ci): scripts/*.sh.

Lint fixes (reviewed, behavior-preserving — no test weakened):
- ruff SIM105: try/except-pass -> contextlib.suppress (abra.py app_config rm; lifecycle.py janitor).
- ruff SIM115: open().read() -> with open() (run_recipe_ci.py redaction-values + gitea-token).
- statix: merge repeated sops `secrets.*` keys into one `secrets = { ... }` (comments kept);
  empty fn pattern `{ ... }:` -> `_:` (packages.nix).
- deadnix: drop unused lambda args (flake `self`; configuration.nix `lib`; overlay `final` -> `_`).

Verified on cc-ci: `scripts/lint.sh` -> lint: PASS; nixosConfigurations.cc-ci evaluates;
all Python byte-compiles. The deployed bridge/dashboard/runner source changes hash (reformat),
so cc-ci will be rebuilt to the new closure in W2 before the cold D1-D10 re-verification.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/keycloak/test_backup.py

@@ -1,11 +1,12 @@
 """keycloak — backup/restore stage (D2): create a realm, backup, delete it (mutate), restore,
 assert the realm is back (mariadb restored to the backed-up state)."""
+
 import os
 import sys
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
-from harness import lifecycle  # noqa: E402
 import kc_admin  # noqa: E402
+from harness import lifecycle  # noqa: E402
 
 
 def test_backup_mutate_restore(deployed):
@@ -24,7 +25,8 @@ def test_backup_mutate_restore(deployed):
 
     # 3) restore -> realm returns
     lifecycle.restore_app(domain)
-    lifecycle.wait_healthy(domain, path="/realms/master", ok_codes=(200,),
-                           deploy_timeout=600, http_timeout=600)
+    lifecycle.wait_healthy(
+        domain, path="/realms/master", ok_codes=(200,), deploy_timeout=600, http_timeout=600
+    )
     tok2 = kc_admin.admin_token(domain, pw)
     assert kc_admin.marker_realm_exists(domain, tok2), "restore did not bring back the realm"