feat(V2): /mcp-cross/tools/get_historical with cross-exchange consensus

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Add a unified historical endpoint that fans out to every exchange
supporting the requested (asset_class, symbol) pair, then merges the
results into a single consensus candle series with per-bar divergence
metrics:
  - candles[i].close = median across sources
  - candles[i].sources = count of contributing exchanges
  - candles[i].div_pct = (max-min)/median for that bar's close

Crypto routes BTC/ETH/SOL across Bybit + Hyperliquid + Deribit; equities
route to Alpaca for now (IBKR omitted from MVP because its bars endpoint
takes a relative period instead of start/end). Partial failures return a
warning envelope (failed_sources) instead of failing the whole request;
all sources failing → HTTP 502.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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src/cerbero_mcp/exchanges/cross/__init__.py