Add open emergence module for behavioral diversity monitoring

[Finanzgoblin]

Summary

• Implements five independently useful emergence components that sit alongside the core optimization loop, holding optimization in tension with exploration (ref Exploration collapse: agents converge to fixed policies, losing novel behavior discovery #490)
• Gap 5: Novelty detection via shape-based trajectory codebook (NoveltyDetector, NoveltyAwareAdapter)
• Gap 1: Entropy monitoring with sliding-window collapse detection (TrajectoryEntropy, ExplorationDecayMonitor)
• Gap 3: Pareto tension tracking across reward dimensions (ParetoTracker)
• Gap 2: Reward staleness auditing via rank correlation (RewardStalenessAuditor, RewardAuditAdapter)
• Gap 4: Dissolution engine with TTL and validity conditions (DissolutionEngine)

All components are non-invasive (use existing interfaces only), best-effort (never block the core loop), and include dissolution conditions documenting when each component should be removed.

Design doc: docs/open-emergence-design.md

Test plan

• 84 unit tests covering all five gaps
• Verify CI passes on Linux (tests include Windows platform compat shims in conftest)
• Review dissolution conditions for each component
• Integration test with a real training loop (future follow-up)

🤖 Generated with Claude Code

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