Cleanup: remove dead code, stale docs, and all non-main branches

- Delete back-compat shims data_provider.py / oanda_provider.py;
  test_all.py now imports providers.* directly (ForexDataProvider name
  retired; the two shim-only tests removed, 268 -> 266 tests)
- Delete backtest/research/calendar_store.py (no importer, no entry
  point); config.py audit comment reworded
- Delete executed plan doc (2026-07-21 centralized-config) and the two
  unbuildable guide PDFs; HTML guides remain the source of truth
- OANDA_MIGRATION_ROADMAP.md status header corrected: phases 1-2
  shipped 2026-07-28, feed is live on Oanda; phases 3-6 still unbuilt
- Branches deleted locally + on both remotes: oanda_demo (merged),
  web-dashboard, eurusd-modular, reversal-exit-alert (owner-approved
  permanent deletion); July stash dropped

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019zR58p8ACW1oJ5QXVUZ5es

CLAUDE.md

@@ -11,7 +11,7 @@ Every numeric threshold in `config.py` and `pair_signals/xauusd.py` was backtest
 ## Commands
 
 ```bash
-python test_all.py                      # QA suite: 268 tests, 18 modules, no network (mocked)
+python test_all.py                      # QA suite: 266 tests, 18 modules, no network (mocked)
 python main.py --pair XAUUSD --timeframe H1 --detail   # CLI signal report (--json for full dump)
 python telegram_bot.py                  # the bot (refuses to boot without credentials)
 python oanda_daemon.py                  # auto-execution daemon on Oanda practice account
@@ -49,7 +49,7 @@ Signal currency everywhere is `SignalStrength` (−2..+2). DataFrames are UTC tz
 
 ### Layers
 
-- **`providers/`** — one class per provider subclassing `BaseDataProvider` (`providers/base.py`), which owns everything the pipeline depends on: TTL+boundary cache, forming-candle drop, freshness check, validate/clean, paginated `fetch_range` (feeds the backtester from any provider), optional tick streaming. Subclasses implement only `_fetch_raw` + symbol/interval maps. Registry + `make_data_provider` in `providers/__init__.py`; config.json `data_providers.active` selects the live feed. `data_provider.py`/`oanda_provider.py` are back-compat shims. A test enforces that subclasses don't override shared base methods. Tiingo is candles-only — do not re-add spread display from its free FX feed (two-tier indicative quotes, removed 2026-07-23).
+- **`providers/`** — one class per provider subclassing `BaseDataProvider` (`providers/base.py`), which owns everything the pipeline depends on: TTL+boundary cache, forming-candle drop, freshness check, validate/clean, paginated `fetch_range` (feeds the backtester from any provider), optional tick streaming. Subclasses implement only `_fetch_raw` + symbol/interval maps. Registry + `make_data_provider` in `providers/__init__.py`; config.json `data_providers.active` selects the live feed. A test enforces that subclasses don't override shared base methods. Tiingo is candles-only — do not re-add spread display from its free FX feed (two-tier indicative quotes, removed 2026-07-23).
 - **`engine.py`** — `TechnicalEngine`: 9 scored indicators (ema_trend, rsi, macd, bollinger, adx, roc, keltner, divergence, candlestick) + ATR as context. Regime classification (trending_up/down, `trending` = mixed/direction-UNKNOWN, transitioning, ranging) drives per-indicator weight multipliers and regime-aware RSI reinterpretation. Compute order matters (ATR first; MACD always computed even when not a pillar — divergence needs the histogram). Private series ride on the result as `_underscore` attrs; scorers/formatters skip anything `_`-prefixed or weight-0.
 - **`signal_aggregator.py`** — MTF agreement, diminishing-decay penalty system, exhaustion hard block, quality grading, then an ordered chain of post-grade gates (session, XAU SELL quality/vol/hour, regime blocks, M5 noise gates), then three setup generators: XAU ATR (A+/A), generic swing-based, plus the M5 pullback (`XAU_PB`) and chart-pattern (`XAU_CP`, `chart_patterns.py`) entry paths. `TradeSetup.strategy` selects trailing params; trail params are stamped on the setup from the *producing* config so per-TF overrides reach formatters.
 - **`pair_signals/`** — per-pair config factories. **Always use the factory (`produce_signal` / `make_config`), never bare `PlatformConfig()`** — the factory applies the config.json overlay first, then the validated per-TF deltas (M5 hour-9 block, M15 trail arm 0.70, M15 SELL-hour block, etc.; evidence in the docstring). A test enforces factory ≡ inline-config equivalence. Confirmation map: M5→[M15,H1], M15→[M5,H1], H1→[M15,H4], H4→[H1,D1].