Add CLAUDE.md with two known bugs

Bug 1: concurrent TF scans exhaust free-tier API credits (8/min limit)
Bug 2: XAUUSD synthetic fallback uses wrong base price (~1.0 vs ~3300)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# ForexBot2 — Known Bugs & Dev Notes
+
+## Bug 1 — Concurrent TF scans exhaust API credits instantly
+
+**Symptom:**
+```
+Batch prefetch failed for 1wk: You have run out of API credits for the current minute.
+9 API credits were used, with the current limit at https://twelvedata.com/pricing
+```
+Warnings appear for every timeframe (1h, 4h, 1d, 1wk) in rapid succession.
+
+**Root cause:**
+`telegram_bot.py` runs all 4 `SCAN_TIMEFRAMES` concurrently via `ThreadPoolExecutor`.
+Each `SignalAggregator` fires its own batch prefetch simultaneously.
+Free tier limit is **8 credits/minute** — 4 parallel scans hit this in under a second.
+
+**Impact:**
+Confirmation timeframes fail and fall back to synthetic data.
+Primary TF still has real data (first request wins the credits).
+
+**Fix (not yet implemented):**
+Run timeframes sequentially with a 60-second wait between each, or reduce
+`SCAN_TIMEFRAMES` to a single primary TF and use the engine's built-in
+multi-timeframe confirmation (which already batches efficiently in 3 calls).
+
+---
+
+## Bug 2 — XAUUSD (Gold) shows wrong price (~1.01 instead of ~3300)
+
+**Symptom:**
+```
+Entry: 1.01037
+Take Profit: 1.00767  (+0.3 pips)
+Stop Loss: 1.01172  (-0.1 pips)
+```
+
+**Root cause:**
+Two compounding issues:
+
+1. XAUUSD is not available on the Twelve Data **free tier** — API returns no data.
+2. `data_provider._generate_synthetic_data()` uses a `pair_params` dict for base
+   prices. XAUUSD either falls through to a wrong default (~1.0) instead of the
+   correct ~3300 baseline.
+
+Check `data_provider.py` → `_generate_synthetic_data()` → `pair_params` dict.
+Verify `"XAUUSD=X"` has a correct `"price"` entry around `3300.0`.
+
+**Impact:**
+All indicator values, entry, TP, and SL for XAUUSD are meaningless when
+running on the free tier (synthetic data with wrong base price).
+
+**Fix (not yet implemented):**
+- Correct the base price in `pair_params` for `XAUUSD=X`.
+- Add a bot-level guard: if `report.current_price < 100` for XAUUSD,
+  suppress the trade setup and show a "data unavailable" message instead.
+
+---
+
+## Notes
+
+- Free tier: 8 credits/min, 800 credits/day. Each full scan = ~21 credits.
+- Supported pairs (live data on free tier): EURUSD, GBPUSD, USDJPY, USDCHF,
+  AUDUSD, USDCAD, NZDUSD, EURGBP, EURJPY, GBPJPY, AUDJPY, EURCHF, CADJPY.
+- All other symbols (XAU, XAG, commodities, indices) fall back to synthetic GBM data.