chore: make the whole tree ruff-clean, not just app/

CI only lints app/, so 11 findings had accumulated in tests/ and scripts/.

Mechanical and behaviour-neutral, but two were not auto-fixable and needed a
judgement call rather than `ruff --fix`:

- E741 in run_fip_breadth_diagnostics: `l` is the OHLCV low and is genuinely
  used, so this was a naming fix (`l` -> `lo`), not a deletion.
- F841 in the same file: `vol_ix`/`momr_ix` are assigned from a pure local
  `_index()` and never read, so removing them cannot change any output. Their
  upstream `vol_weeks`/`momr_weeks` maps *are* used further down and stay; the
  comment above `_index` was corrected to say so.

The rest are unused imports and f-strings without placeholders (literal
markdown table headers, so identical output).

Verified beyond the linter, since py_compile does not catch a removed-but-used
import: every removed symbol has zero remaining references, all scripts compile,
and the full unit suite passes (852 passed, 1 skipped).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/run_daily_reentry_matrix.py

@@ -31,7 +31,6 @@ if str(ROOT) not in sys.path:
 
 from scripts.research_rankings import (  # noqa: E402
     _live_universe_rank_map,
-    _period_percentiles,
 )
 
 POLICY_NAMES = (

scripts/run_execution_recovery_matrix.py

@@ -57,7 +57,6 @@ if str(ROOT) not in sys.path:
 
 from scripts.research_rankings import (  # noqa: E402
     _live_universe_rank_map,
-    _period_percentiles,
 )
 
 # Must match Phase A cache when reusing research-cands.pkl

scripts/run_fip_breadth_diagnostics.py

@@ -162,13 +162,13 @@ def _load_job(conn, symbol: str, spy: dict) -> tuple | None:
     if len(rows) < 90:
         return None
     ords, opens, highs, lows, closes, vols = [], [], [], [], [], []
-    for d, o, h, l, c, v in rows:
+    for d, o, h, lo, c, v in rows:
         if isinstance(d, str):
             d = date.fromisoformat(d[:10])
         ords.append(d.toordinal())
         opens.append(float(o))
         highs.append(float(h))
-        lows.append(float(l))
+        lows.append(float(lo))
         closes.append(float(c))
         vols.append(float(v or 0))
     return (symbol, ords, opens, highs, lows, closes, vols, spy)
@@ -275,7 +275,8 @@ def main() -> None:
     vol_weeks = collected.get("vol_6m") or {}
     momr_weeks = collected.get("mom_12_1_resid") or {}
 
-    # Index mom/vol by (week, symbol) for joins
+    # Index mom by (week, symbol) for joins. vol/momr are consumed as week maps
+    # directly further down, so they need no index.
     def _index(weeks_map: dict) -> dict[tuple, dict]:
         out: dict[tuple, dict] = {}
         for wk, recs in weeks_map.items():
@@ -290,8 +291,6 @@ def main() -> None:
         return out
 
     mom_ix = _index(mom_weeks)
-    vol_ix = _index(vol_weeks)
-    momr_ix = _index(momr_weeks)
 
     # Per-week membership + extended checks via shared rich filter
     same_week: dict[tuple, list[tuple[float, float]]] = defaultdict(list)
@@ -606,8 +605,8 @@ def _update_md(path: Path, results: dict, artifact: Path) -> None:
         "",
         "### Authoritative unconditional fip (liquid top-N, post-mask)",
         "",
-        f"| metric | value |",
-        f"|---|---|",
+        "| metric | value |",
+        "|---|---|",
         f"| mean_ic | {h.get('mean_ic')} |",
         f"| ic_t_stat | {h.get('ic_t_stat')} |",
         f"| weeks | {h.get('weeks')} |",

scripts/run_fip_breadth_research.py

@@ -162,8 +162,8 @@ def _write_md(path: Path, payload: dict) -> None:
     row = br.get("row") or br
     if row:
         lines.extend([
-            f"| metric | value |",
-            f"|---|---|",
+            "| metric | value |",
+            "|---|---|",
             f"| mean_ic | {row.get('mean_ic')} |",
             f"| ic_t_stat | {row.get('ic_t_stat')} |",
             f"| ic_positive_pct | {row.get('ic_positive_pct')} |",

scripts/run_prod_book_universe_matrix.py

@@ -26,7 +26,6 @@ import os
 import pickle
 import sys
 import time
-from collections import defaultdict
 from concurrent.futures import ProcessPoolExecutor
 from datetime import date, datetime
 from pathlib import Path

scripts/run_research_matrix.py

@@ -70,7 +70,6 @@ if str(ROOT) not in sys.path:
 
 from scripts.research_rankings import (  # noqa: E402
     _live_universe_rank_map,
-    _period_percentiles,
 )
 
 CACHE_VERSION = "research-matrix-v1-daily-prod"