feat: port Java Supersonic bot framework and cash game bots to Rust
Framework (holdem_core::game::strategy):
- HandAnalyzer: 15 hand analysis methods (overpair, flush draw, OESD, outs, etc.)
- HandHelper: 14 board texture and hand strength methods (Kill Phil grouping, etc.)
- ActionRecorder: per-street action tracking with player filtering
- StrategyContext: read-only game state snapshot with position/pot odds helpers
- Strategy trait + ModularStrategy: composite pattern with 3 voting modes
(FirstApplicable, Democratic, Random)
Cash Game Bots (holdem_bots crate — private, exclude from public mirrors):
- PostFlopStrategy: shared postflop logic using hand strength approximation
- BigStackBot: NL cash strategy for stack > 25 BB (preflop + postflop)
- ShortStackBot: NL cash strategy for stack ≤ 25 BB (preflop + postflop)
- Full preflop decision trees ported from Java Supersonic framework
Repository restructuring:
- Created holdem_bots crate with feature-gated dependency from holdem_sim
- Added game::strategy module to holdem_core
- Cleaned up 4 unused evaluator stubs
- Moved plans/ to docs/, added proptest-regressions/ to .gitignore
- Added ARCHITECTURE_BOT_FRAMEWORK.md documentation
Tests: 58 new strategy tests + 17 bot tests (all passing)