backtest cleanup: drop four research/one-time scripts; books and stale cache moved out (owner decisions 2026-09-15)

Discussion-first cleanup of backtest/ and scripts/. Nothing in the signal
core or the backtester changed.

Removed (last commit containing them: 931b265):
- backtest/diagnose_filters.py + its two Module 18 tests
- scripts/shadow_scan.py (Phase 4 shadow scan, never run)
- scripts/backfill_news_archive.py, scripts/migrate_signal_log_news.py
  (one-time scripts; the interning test keeps its live-path half, the
  prune test goes)

Kept: the replay-recording stack (replay_record.py, replay_scorecard.py,
ff_calendar_scraper.py, cache/calendar.parquet, Module 33).

Local gitignored data was moved to ~/Development/ForexBot2_trash_2026-09-15
(346 MB) for the owner to delete: all 35 pinned backtest/*.csv books, the
three research output folders, the BTC/ETH cache snapshots, the Tiingo
parquets and 13 uncited Oanda windows. The three research-folder ignore
rules are dropped with the folders.

Verification: all five gate books regenerate offline from the pruned cache
with the recorded MD5s (M5 W2 29120a1e, M15 W2 d185f099, M15 OOS 6f8f24b4,
H1 W3 3b45d12b, H4 W3 e75adae1; NumPy CPU, 0 cache fallbacks). Suite
506 passed, 0 failed, 33 modules.

test_all.py

@@ -4544,10 +4544,10 @@ def _():
 
 
 # ══════════════════════════════════════════════════════════════════════
-#  MODULE 18: --set research override + diagnose_filters tag freshness
+#  MODULE 18: --set research override
 # ══════════════════════════════════════════════════════════════════════
 
-print("\n═══ Module 18: --set override + diagnose tags ═══")
+print("\n═══ Module 18: --set override ═══")
 
 
 @test("--set: nested float/bool/JSON-list overrides apply with typing")
@@ -4603,42 +4603,6 @@ def _():
     assert _parse_args(["--pair", "XAUUSD"]).set == []
 
 
-@test("diagnose_filters: every filter tag has a live emitter (staleness guard)")
-def _():
-    import inspect
-    import diagnose_filters
-    import signal_aggregator as sa
-    src = inspect.getsource(sa)
-    tag_src = inspect.getsource(diagnose_filters.classify_bar)
-    # Extract the tag strings from the ordered list in classify_bar.
-    import re
-    tags = re.findall(r'\("([^"]+)",\s+"[A-Z0-9_]+"\)', tag_src)
-    assert len(tags) >= 25, f"tag extraction broke: found {len(tags)}"
-    for tag in tags:
-        assert tag in src, f"filter tag '{tag}' has no emitter in signal_aggregator.py"
-
-
-@test("diagnose_filters: one tag per warning, specific prefix wins")
-def _():
-    import diagnose_filters as d
-    from signal_aggregator import SignalReport
-
-    class _R:
-        pass
-    r = _R()
-    r.warnings = [
-        "M5 FILTER: SELL quality A capped — high-conviction M5 shorts enter at extremes",
-        "SELL FILTER: 15:00 UTC entry blocked for shorts",
-        "TREND EXHAUSTION — price extended >3.5 ATR past swing high",
-    ]
-    r.final_signal = SignalStrength.SELL
-    r.signal_quality = "D"
-    r.trade_setup = None
-    outcome, hits = d.classify_bar(r, True)
-    assert outcome == "LOW_QUALITY"
-    assert hits == ["M5_SELL_QUALITY", "SELL_HOUR", "TREND_EXHAUSTION"], hits
-
-
 # ══════════════════════════════════════════════════════════════════════
 #  MODULE 19: DeepSeek news enrichment (llm_client + news_engine seams)
 # ══════════════════════════════════════════════════════════════════════
@@ -8827,7 +8791,6 @@ def _():
 def _():
     import sqlite3
     import signal_log as slog
-    from scripts.migrate_signal_log_news import migrate, prune_orphans
     fd, path = tempfile.mkstemp(suffix=".db")
     os.close(fd)
     try:
@@ -8859,19 +8822,6 @@ def _():
             "SELECT id, headlines_resolved FROM signals_with_news").fetchall())
         assert json.loads(view[legacy_id])[0]["headline"] == "legacy"
         assert json.loads(view[r2])[0]["headline"] == "Fed signals rate hike"
-        # migration moves the legacy blob and is idempotent
-        stats = migrate(lg._conn)
-        assert stats["rows"] == 1 and stats["headlines_interned"] == 1
-        assert migrate(lg._conn)["rows"] == 0
-        row = lg._conn.execute(
-            "SELECT headlines_json, headlines_hash FROM signals WHERE id=?",
-            (legacy_id,)).fetchone()
-        assert row[0] is None and row[1]
-        assert json.loads(slog.read_news(lg._conn, legacy_id)[1])[0][
-            "headline"] == "legacy"
-        lg._conn.execute("DELETE FROM signals WHERE id=?", (legacy_id,))
-        lg._conn.commit()
-        assert prune_orphans(lg._conn) == 2, "legacy headline + event blobs"
         lg.close()
     finally:
         slog.reset_loggers_for_tests()
@@ -9127,46 +9077,6 @@ def _():
         "a real evaluator fault must be visible in the log"
 
 
-@test("migrate: prune_news_older_than prunes the cutoff calendar day")
-def _():
-    import sqlite3
-    import importlib.util
-    spec = importlib.util.spec_from_file_location(
-        "_mig_test", os.path.join(os.path.dirname(os.path.abspath(__file__)),
-                                  "scripts", "migrate_signal_log_news.py"))
-    mig = importlib.util.module_from_spec(spec)
-    spec.loader.exec_module(mig)
-
-    fd, path = tempfile.mkstemp(suffix=".db")
-    os.close(fd)
-    try:
-        con = sqlite3.connect(path)
-        con.execute("CREATE TABLE signals (id INTEGER PRIMARY KEY,"
-                    " logged_at TEXT, headlines_hash TEXT, events_hash TEXT)")
-        con.execute("CREATE TABLE news_snapshots (hash TEXT PRIMARY KEY,"
-                    " body TEXT)")
-        now = datetime.now(timezone.utc)
-        # Genuinely older than the 30-day cutoff, but on the SAME calendar
-        # day as it — the case the raw string compare put on the wrong side
-        # ('T' sorts after ' ').
-        boundary = (now - timedelta(days=30)).replace(
-            hour=0, minute=0, second=1, microsecond=0).isoformat()
-        con.executemany(
-            "INSERT INTO signals VALUES (?,?,?,?)",
-            [(1, boundary, "h1", "e1"), (2, now.isoformat(), "h2", "e2")])
-        con.executemany("INSERT INTO news_snapshots VALUES (?,?)",
-                        [("h1", "{}"), ("e1", "{}"), ("h2", "{}"), ("e2", "{}")])
-        con.commit()
-        n = mig.prune_news_older_than(con, 30)
-        assert n == 1, f"the cutoff-day row must prune, got {n}"
-        kept = con.execute(
-            "SELECT headlines_hash FROM signals ORDER BY id").fetchall()
-        assert kept == [(None,), ("h2",)], kept
-        con.close()
-    finally:
-        os.unlink(path)
-
-
 # ══════════════════════════════════════════════════════════════════════
 #  MODULE 29: stake-multiplier sizing — features + record-keeping
 # ══════════════════════════════════════════════════════════════════════