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>

pyproject.toml

@@ -86,10 +86,14 @@ select = [
 ignore = [
     "PLR0913",  # too many arguments (we accept config-heavy functions)
     "PLR2004",  # magic value (we have many domain constants in tests)
+    "PLR0911",  # too many return statements (rule engines have many early returns)
+    "RUF001",  # ambiguous unicode in strings (we use math symbols × ≤ ≥)
+    "RUF002",  # ambiguous unicode in docstrings
+    "RUF003",  # ambiguous unicode in comments
 ]
 
 [tool.ruff.lint.per-file-ignores]
-"tests/**" = ["PLR2004", "ARG", "S101"]
+"tests/**" = ["PLR2004", "ARG", "S101", "ERA001", "B017"]
 
 [tool.ruff.format]
 quote-style = "double"