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>

CLAUDE.md

@@ -59,18 +59,19 @@ Nota: nel modulo `sentiment` "bybit" resta come **fonte dati pubblica**
 
 ## Interfacce dati
 
-- **`/mcp` (comune, raccomandata)** — `get_instruments` con schema uniforme
-  (ogni elemento porta `exchange`, `fees`, `history_start`, `type`, `tick_size`,
-  `native`); `get_historical` con `exchange` selezionabile (singolo venue).
-  Supporta deribit + hyperliquid (IBKR non ancora integrato).
-- **`/mcp-cross`** — `get_historical` a consenso multi-exchange (mediana OHLC,
-  `sources`, `div_pct`).
-- **`/mcp-{exchange}`** — router per-exchange legacy, ancora attivi.
+- **`/mcp` (comune)** — gli **unici** tool dati trasversali. `get_instruments`
+  (schema uniforme: `exchange`, `fees`, `history_start`, `type`, `tick_size`,
+  `native`); `get_historical` e `get_indicators` con `exchange` opzionale →
+  singolo venue se valorizzato, **consenso** multi-exchange (mediana OHLC +
+  `div_pct`) se omesso. Supporta deribit + hyperliquid (IBKR non integrato).
+- **`/mcp-{exchange}`** — router per-exchange per il resto (ticker, ordini,
+  options analytics, …). **NON** espongono più `get_historical`/`get_indicators`.
 
-Convenzione: ogni `get_historical` ritorna la chiave uniforme
+Convenzione: `get_historical` ritorna la chiave uniforme
 `candles: [{timestamp(ms), open, high, low, close, volume}]` (validatore in
 `common/candles.py`). `fees`/`history_start` sono popolati **live dove
-l'upstream li espone** (oggi: Deribit), altrimenti `null`.
+l'upstream li espone** (oggi: Deribit), altrimenti `null`. Il calcolo indicatori
+è centralizzato in `common/indicators.py::compute_indicators`.
 
 ## Convenzioni