fix(lint): resolve ruff C901+F841 in new detectors

Move # noqa: C901 to the def line (black splits multi-line signatures,
so the suppression must be on the first line ruff reports). Remove
unused text_lower (grant_funding_trails) and version_date (vote_date_alignment).
All four files now pass black --check and ruff check clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: MARS

src/oraculus_di_auditor/analysis/grant_funding_trails.py

@@ -101,7 +101,9 @@ def _dollar_amounts(text: str) -> list[str]:
 # ---------------------------------------------------------------------------
 
 
-def detect_grant_funding_trail_anomalies(doc: dict[str, Any]) -> list[dict[str, Any]]:
+def detect_grant_funding_trail_anomalies(  # noqa: C901
+    doc: dict[str, Any],
+) -> list[dict[str, Any]]:
     """Detect missing or broken grant funding trail signals in *doc*."""
     findings: list[dict[str, Any]] = []
     if not isinstance(doc, dict):
@@ -111,7 +113,6 @@ def detect_grant_funding_trail_anomalies(doc: dict[str, Any]) -> list[dict[str,
     if not text.strip():
         return findings
 
-    text_lower = text.lower()
     has_grant_ref = bool(_GRANT_REFERENCE.search(text))
     if not has_grant_ref:
         return findings  # not a grant-related document

src/oraculus_di_auditor/analysis/vote_date_alignment.py

@@ -135,7 +135,9 @@ def _extract_dates_from_text(text: str) -> list[date]:
 # ---------------------------------------------------------------------------
 
 
-def detect_vote_date_alignment_anomalies(doc: dict[str, Any]) -> list[dict[str, Any]]:
+def detect_vote_date_alignment_anomalies(  # noqa: C901
+    doc: dict[str, Any],
+) -> list[dict[str, Any]]:
     """Detect vote / authorization vs. execution date misalignment in *doc*."""
     findings: list[dict[str, Any]] = []
     if not isinstance(doc, dict):
@@ -199,7 +201,6 @@ def detect_vote_date_alignment_anomalies(doc: dict[str, Any]) -> list[dict[str,
     # ------------------------------------------------------------------
     auth_date = _parse_iso(doc.get("authorization_date") or doc.get("approval_date"))
     exec_date = _parse_iso(doc.get("execution_date") or doc.get("effective_date"))
-    version_date = _parse_iso(doc.get("version_date"))
 
     if auth_date and exec_date and exec_date < auth_date:
         findings.append(