test(dolt): anchor the real-clone smoke test to the clone, not the wall clock

The test built the importer with today=date.today() while running against a
fixed local clone with do_pull=False, so its forward horizon shrank by a day
per real day. It has now decayed past the initial-load gate -- 19d against the
21d MIN_FORWARD_HORIZON_DAYS floor -- and would have kept failing, worse each
day.

Anchors today to the clone's own calendar (max reporting date across the seeded
dot-free symbols, minus 35 days, mirroring the ~35d horizon the importer's own
comment cites) and uses that date in the forward-calendar assertion. Also
surfaces run.error_details on failure, which is how the cause was found.

Test-only. MIN_FORWARD_HORIZON_DAYS and the importer are untouched: production
pulls fresh data on every run and was never affected by this.

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

tests/unit/test_dolt_earnings_importer.py

@@ -12,7 +12,7 @@ from __future__ import annotations
 import os
 import shutil
 import tempfile
-from datetime import date
+from datetime import date, timedelta
 from pathlib import Path
 
 import pytest
@@ -252,13 +252,29 @@ async def test_real_clone_smoke(engine):
     # A few tickers spanning near + further-out reporters so the initial-load
     # forward-horizon gate (>= 21d) is satisfied on the fixed clone.
     await _seed_tickers(factory, ["AAPL", "MSFT", "NVDA", "JPM", "BRK.B"])
+
+    # "today" is anchored to the clone, NOT the wall clock. The clone is fixed
+    # and do_pull=False, so a wall-clock today makes this test decay: the
+    # forward horizon shrinks a day per real day and eventually trips the
+    # >= 21d gate (it did, at 19d). Anchoring keeps it time-stable. Production
+    # pulls fresh data and is unaffected. Dot-free symbols only, so the query
+    # needs no symbol normalisation.
+    rows = await dolt_client.query_csv(
+        _CLONE_DIR,
+        "SELECT MAX(`date`) AS max_date FROM earnings_calendar "
+        "WHERE act_symbol IN ('AAPL', 'MSFT', 'NVDA', 'JPM')",
+        binary=_DOLT_BIN,
+    )
+    max_date = date.fromisoformat(rows[0]["max_date"])
+    today = max_date - timedelta(days=35)  # ~35d horizon, per the importer's note
+
     imp = DoltEarningsImporter(
-        repo_dir=_CLONE_DIR, binary=_DOLT_BIN, today=date.today(), do_pull=False, dolt=dolt_client
+        repo_dir=_CLONE_DIR, binary=_DOLT_BIN, today=today, do_pull=False, dolt=dolt_client
     )
     run = await run_import(imp, engine=engine)
 
-    assert run.status == STATUS_PROMOTED
+    assert run.status == STATUS_PROMOTED, run.error_details
     events = await _events(factory)
     assert events, "no earnings parsed from the real clone"
-    assert any(e.announce_date > date.today() for e in events), "no forward calendar"
+    assert any(e.announce_date > today for e in events), "no forward calendar"
     assert any(e.eps_actual is not None for e in events), "no calendar<->history pairing"