research: sector residual, earnings gap/SUE, history-depth scaffolding

Tier-1 alpha research (local only, no production deploy):

Sector residual momentum: two-factor SPY+sector residual and sector demean signals, IC harness + A/B. Sector resid clears pre-registered bars narrowly (PROMOTE for human wire design only). Sector demean fails t vs market resid.

Earnings: earnings_events backfill (FMP bulk paid; FMP/AV per-symbol), 2a gap diagnostic report-only, 2b SUE IC (PARK; incomplete 48/506 coverage).

History-depth: pre-registered doc + runner for MacBook deep rebuild/harness.

Do not ship production residual or filters from this branch.

reports/earnings-backfill-status.json

@@ -0,0 +1,15 @@
+{
+  "mode": "per_symbol",
+  "fmp_requests": 25,
+  "events_written_this_run": 2541,
+  "total_events": 5612,
+  "symbols_done": 48,
+  "symbols_universe": 506,
+  "announce_date_range": {
+    "min": "1985-08-31",
+    "max": "2026-07-16"
+  },
+  "events_with_actual_and_estimate": 5018,
+  "budget": 25,
+  "complete": false
+}