# Changelog

All notable changes to Delta-Behavior will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

### Planned
- WASM module for browser-based coherence enforcement
- Async runtime integration (tokio, async-std)
- Metric export for Prometheus/Grafana monitoring
- Python bindings via PyO3

---

## [0.1.0] - 2026-01-28

### Added

#### Core Library
- `Coherence` type with range validation (0.0-1.0)
- `CoherenceBounds` for defining threshold parameters
- `CoherenceState` for tracking coherence history and trends
- `DeltaSystem` trait for implementing coherence-preserving systems
- `DeltaConfig` with preset configurations (`default()`, `strict()`, `relaxed()`)
- `DeltaEnforcer` implementing three-layer enforcement

#### Configuration Types
- `EnergyConfig` for soft constraint layer parameters
- `SchedulingConfig` for medium constraint layer parameters
- `GatingConfig` for hard constraint layer parameters

#### Transition System
- `Transition<T>` generic transition wrapper
- `TransitionConstraint` for defining transition limits
- `TransitionResult` enum (Applied, Blocked, Throttled, Modified)

#### Attractor Dynamics
- `Attractor<S>` for representing stable states
- `AttractorBasin<S>` for tracking basin membership
- `GuidanceForce` for computing attractor-directed forces

#### Enforcement
- Three-layer enforcement stack (Energy, Scheduling, Gating)
- `EnforcementResult` enum (Allowed, Blocked, Throttled)
- Recovery mode handling with configurable margin

#### Applications (feature-gated)
- **01 Self-Limiting Reasoning** (`self-limiting`)
  - `SelfLimitingReasoner` with coherence-based depth limiting
  - Automatic activity reduction under uncertainty

- **02 Computational Event Horizons** (`event-horizon`)
  - `ComputationalHorizon` with asymptotic slowdown
  - No hard recursion limits

- **03 Artificial Homeostasis** (`homeostasis`)
  - `HomeostasisSystem` with multi-variable regulation
  - Coherence-based survival mechanism

- **04 Self-Stabilizing World Models** (`world-model`)
  - `StabilizingWorldModel` with belief coherence
  - Hallucination prevention via coherence gating

- **05 Coherence-Bounded Creativity** (`creativity`)
  - `CreativeEngine` with novelty/coherence balance
  - Bounded exploration in generative tasks

- **06 Anti-Cascade Financial Systems** (`financial`)
  - `AntiCascadeMarket` with coherence-based circuit breakers
  - Order rejection for cascade-inducing trades

- **07 Graceful Aging** (`aging`)
  - `AgingSystem` with complexity reduction
  - Function preservation under simplification

- **08 Swarm Intelligence** (`swarm`)
  - `CoherentSwarm` with global coherence enforcement
  - Action modification for coherence preservation

- **09 Graceful Shutdown** (`shutdown`)
  - `GracefulSystem` with shutdown as attractor
  - Automatic safe termination under degradation

- **10 Pre-AGI Containment** (`containment`)
  - `ContainmentSubstrate` with capability ceilings
  - Coherence-bounded intelligence growth

#### Documentation
- Comprehensive rustdoc comments on all public APIs
- Module-level documentation with examples
- `WHITEPAPER.md` with executive summary and technical deep-dive
- `docs/API.md` comprehensive API reference
- ADR documents for all major design decisions
- Mathematical foundations documentation

#### Testing
- Unit tests for all core types
- Integration tests for enforcement stack
- Acceptance test demonstrating Delta-behavior under chaos
- Per-application test suites

#### Architecture
- Domain-Driven Design structure
- Clean separation between core, applications, and infrastructure
- Feature flags for minimal binary size

### Technical Details

#### Coherence Bounds (Defaults)
| Parameter | Value | Purpose |
|-----------|-------|---------|
| `min_coherence` | 0.3 | Absolute floor (writes blocked below) |
| `throttle_threshold` | 0.5 | Rate limiting begins |
| `target_coherence` | 0.8 | System seeks this level |
| `max_delta_drop` | 0.1 | Maximum per-transition drop |

#### Energy Cost Model
```
cost = base_cost * (1 + instability)^exponent
```

Where:
- `base_cost = 1.0`
- `exponent = 2.0`
- `max_cost = 100.0`
- `budget_per_tick = 10.0`

#### Supported Platforms
- Linux (x86_64, aarch64)
- macOS (x86_64, aarch64)
- Windows (x86_64)
- WASM (wasm32-unknown-unknown)

#### Minimum Supported Rust Version (MSRV)
- Rust 1.75.0

### Dependencies
- No required runtime dependencies (no_std compatible with `alloc`)
- Optional: `std` feature for full functionality

### Breaking Changes
- Initial release - no breaking changes

### Migration Guide
- Initial release - no migration required

---

## [0.0.1] - 2026-01-15

### Added
- Initial project structure
- Proof-of-concept implementation
- Basic documentation

---

## Version History Summary

| Version | Date | Highlights |
|---------|------|------------|
| 0.1.0 | 2026-01-28 | First stable release with full API |
| 0.0.1 | 2026-01-15 | Initial proof-of-concept |

---

## Upgrade Notes

### From 0.0.1 to 0.1.0

The 0.0.1 release was a proof-of-concept. Version 0.1.0 is a complete rewrite with:

1. **New API**: The `DeltaSystem` trait replaces the previous ad-hoc functions
2. **Configuration**: Use `DeltaConfig` instead of individual parameters
3. **Enforcement**: The `DeltaEnforcer` provides unified enforcement
4. **Applications**: Enable specific applications via feature flags

Example migration:

```rust
// 0.0.1 (proof-of-concept)
let coherence = check_coherence(&state);
if coherence > 0.3 {
    apply_transition(&mut state, &delta);
}

// 0.1.0 (stable)
use delta_behavior::{DeltaConfig, enforcement::DeltaEnforcer, Coherence};

let config = DeltaConfig::default();
let mut enforcer = DeltaEnforcer::new(config);

let current = system.coherence();
let predicted = system.predict_coherence(&transition);

match enforcer.check(current, predicted) {
    EnforcementResult::Allowed => system.step(&transition),
    EnforcementResult::Throttled(delay) => std::thread::sleep(delay),
    EnforcementResult::Blocked(reason) => eprintln!("Blocked: {}", reason),
}
```

---

## Links

- [Documentation](https://docs.rs/delta-behavior)
- [Repository](https://github.com/ruvnet/ruvector)
- [Issue Tracker](https://github.com/ruvnet/ruvector/issues)
- [Whitepaper](./WHITEPAPER.md)
- [API Reference](./docs/API.md)

[Unreleased]: https://github.com/ruvnet/ruvector/compare/delta-behavior-v0.1.0...HEAD
[0.1.0]: https://github.com/ruvnet/ruvector/releases/tag/delta-behavior-v0.1.0
[0.0.1]: https://github.com/ruvnet/ruvector/releases/tag/delta-behavior-v0.0.1