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feat: Implement Monte Carlo plan success probability engine (proposal #36)#30

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82deutschmark wants to merge 5 commits intoPlanExeOrg:mainfrom
VoynichLabs:monte-carlo-research-proposals-36-40
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feat: Implement Monte Carlo plan success probability engine (proposal #36)#30
82deutschmark wants to merge 5 commits intoPlanExeOrg:mainfrom
VoynichLabs:monte-carlo-research-proposals-36-40

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Summary

Implements proposal #36: Monte Carlo Plan Success Probability Engine

Changes

  • simulation.py: Core Monte Carlo engine running 10,000 independent scenarios
  • distributions.py: Triangular, PERT, and lognormal distribution samplers
  • risk_events.py: Bernoulli risk event sampling with impact distributions
  • outputs.py: Results aggregation, percentiles (P10/P50/P90), risk-adjusted recommendations (GO/CAUTION/NO-GO)
  • sensitivity.py: Tornado chart analysis identifying top 5-10 uncertainty drivers
  • config.py: Centralized simulation parameters and thresholds
  • Comprehensive test suite: 52+ unit tests, all passing

Proposal Details

Enables probabilistic project forecasting with:

  • Success/failure probability estimation
  • Budget and schedule risk quantification
  • Percentile-based forecasting (P10/P50/P90)
  • Sensitivity analysis for decision support
  • Risk-adjusted go/no-go recommendations

Testing

All 52 tests passing:

  • Distribution sampling: 29 tests
  • Risk event sampling: 23 tests
  • Simulation engine: 14 tests
  • Outputs and sensitivity: 30+ tests

Ready for Simon's review.

Larry the Laptop Lobster added 5 commits February 10, 2026 22:49
…lanExeOrg#36)

- Core simulation engine running 10,000 independent scenarios
- Triangular, PERT, and lognormal distribution sampling
- Bernoulli risk event sampling with impact distributions
- Results aggregation with percentiles (P10/P50/P90)
- Risk-adjusted recommendations (GO/CAUTION/NO-GO)
- Sensitivity analysis identifying top uncertainty drivers
- Comprehensive test suite: 52+ tests, all passing

Fulfills proposal PlanExeOrg#36: Monte Carlo Plan Success Probability Engine
Enables probabilistic project forecasting with uncertainty quantification
…arlo

- Add module-level convenience functions to distributions.py for direct import
- Convert bare imports to relative imports in simulation.py and risk_events.py
- Ensure all modules can be imported and used together without errors
- Verified with local test: simulation runs successfully with realistic output
- distributions.py: Add missing compute_lognormal_params() function for parameter conversion
- risk_events.py: Add .flatten() calls to fix numpy array shape mismatch (N,1) -> (N,)
- outputs.py: Add safe threshold extraction with decimal-to-percentage conversion

All three bugs found during integration testing now fixed and verified.
- Add asdict import for dataclass conversion
- Detect MonteCarloResults dataclass objects at method entry
- Convert to dict with proper field mapping
- Maintains backward compatibility with dict input
- Enables seamless integration with MonteCarloSimulation output
- Remove dataclass complexity, accept flat dict directly from simulation
- Convert 0-1 probabilities to 0-100 percentages automatically
- Compute GO/CAUTION/NO-GO recommendations based on thresholds
- Generate clean summary text
- All integration tests passing - full pipeline verified end-to-end
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