refactor(V2): get_historical & get_indicators are common-only on /mcp

Consolidate the cross-cutting data tools onto the unified interface and
remove their per-exchange duplicates.

- /mcp/tools/get_historical: single call, `exchange` now optional. Set →
  that venue's candles (native symbol); omitted → cross-exchange consensus
  (canonical symbol, median OHLC + div_pct). Folds in the former
  /mcp-cross consensus, whose router is deleted.
- /mcp/tools/get_indicators: new common tool computing sma/rsi/atr/macd/adx
  over the single-or-consensus series. Computation centralized in
  common/indicators.py::compute_indicators (was duplicated per exchange).
- Remove get_historical from /mcp-deribit and /mcp-hyperliquid; remove
  get_technical_indicators (deribit) and get_indicators (hyperliquid),
  including the now-dead client methods, Req schemas and tool wrappers.
  The client get_historical METHODS stay (used by the unified dispatch).

Tests: rewrite cross tests into test_unified (instruments, historical
single + consensus + failures, indicators single + consensus); drop the
old CrossClient test; tighten app-boot surface assertions (/mcp owns the
data tools; no /mcp-cross, no per-exchange historical/indicators).

Docs: API_REFERENCE / README / CLAUDE updated; smoke run_unified.sh now
covers consensus + indicators.

324 passed, ruff clean. Verified live against Deribit/Hyperliquid.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/smoke/README.md

@@ -15,7 +15,9 @@ testnet venga instradato (deribit `get_ticker BTC-PERPETUAL`).
 Verifica end-to-end contro Deribit/Hyperliquid (endpoint pubblici):
 - `get_instruments exchange=deribit` → `fees` e `history_start` popolati live
 - `get_instruments` fan-out → contribuiscono sia deribit sia hyperliquid
-- `get_historical` deribit + hyperliquid → candele non vuote, schema uniforme
+- `get_historical` singolo (deribit, hyperliquid) → candele non vuote
+- `get_historical` consenso (senza `exchange`) → `sources_used` multipli + `div_pct`
+- `get_indicators` singolo + consenso → indicatori calcolati
 - `get_historical exchange=bybit` → `422` (rifiutato a livello schema)
 
 Variabili di ambiente: