Phase 1: core algorithms

Implementa i sette algoritmi puri di docs/03-algorithms.md con
disciplina TDD: 112 test, copertura statement+branch al 100% su
core/ e config/, mypy --strict pulito, ruff pulito.

Moduli:
- config/schema.py: StrategyConfig Pydantic v2 con validatori di
  consistenza (kelly, delta, OTM, spread width, profit/stop).
- core/types.py: OptionQuote e OptionLeg condivisi.
- core/entry_validator.py: validate_entry (accumula motivi) e
  compute_bias (bull_put/bear_call/iron_condor/None).
- core/liquidity_gate.py: check OI/volume/spread/depth + slippage
  stimato in % del credito.
- core/sizing_engine.py: Quarter Kelly con cap 200/1000 EUR e
  bande DVOL.
- core/combo_builder.py: select_strikes (DTE/OTM/delta/width/credit)
  e build (ComboProposal con credit/max_loss/breakeven).
- core/greeks_aggregator.py: somma firmata BUY/SELL, theta in USD.
- core/exit_decision.py: 6 trigger ordinati con eccezione skip-time
  vicino a profit (mark in (50%,70%] credito).
- core/kelly_recalibration.py: full/quarter Kelly, confidence per
  sample size, blend medio in fascia 30-99 trade.

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

src/cerbero_bite/config/__init__.py

@@ -0,0 +1,43 @@
+"""Strategy configuration: schema, loader, validation."""
+
+from cerbero_bite.config.schema import (
+    AssetConfig,
+    DvolAdjustmentBand,
+    EntryConfig,
+    ExecutionConfig,
+    ExitConfig,
+    KellyConfig,
+    LiquidityConfig,
+    McpConfig,
+    MonitoringConfig,
+    ShortStrikeSpec,
+    SizingConfig,
+    SpreadType,
+    SpreadWidthSpec,
+    StorageConfig,
+    StrategyConfig,
+    StructureConfig,
+    TelegramConfig,
+    golden_config,
+)
+
+__all__ = [
+    "AssetConfig",
+    "DvolAdjustmentBand",
+    "EntryConfig",
+    "ExecutionConfig",
+    "ExitConfig",
+    "KellyConfig",
+    "LiquidityConfig",
+    "McpConfig",
+    "MonitoringConfig",
+    "ShortStrikeSpec",
+    "SizingConfig",
+    "SpreadType",
+    "SpreadWidthSpec",
+    "StorageConfig",
+    "StrategyConfig",
+    "StructureConfig",
+    "TelegramConfig",
+    "golden_config",
+]