8-State Reachability Lattice

Module

ReachGraph

Status

IMPLEMENTED

Description

Reachability infrastructure exists with triage integration, but the full 8-state lattice model (U/SR/SU/RO/RU/CR/CU/X) with mathematical state transitions as described is not fully implemented as a distinct subsystem.

What's Implemented

LatticeState enum: src/__Libraries/StellaOps.Reachability.Core/LatticeState.cs -- full 8-state model defined: Unknown (U), StaticReachable (SR), StaticUnreachable (SU), RuntimeObserved (RO), RuntimeUnobserved (RU), ConfirmedReachable (CR), ConfirmedUnreachable (CU), Contested (X); includes VEX mapping and confidence ranges per state
ReachabilityLattice state machine: src/__Libraries/StellaOps.Reachability.Core/ReachabilityLattice.cs -- FrozenDictionary transition table with evidence accumulation; transitions from all states including conflict detection (X state when static and runtime evidence contradict); confidence delta per transition
ConfidenceCalculator: src/__Libraries/StellaOps.Reachability.Core/ConfidenceCalculator.cs -- confidence score computation
IReachabilityIndex: src/__Libraries/StellaOps.Reachability.Core/IReachabilityIndex.cs -- QueryHybridAsync returns HybridReachabilityResult with lattice state
HybridReachabilityResult: src/__Libraries/StellaOps.Reachability.Core/HybridReachabilityResult.cs -- includes lattice state, confidence, and VEX recommendation

What's Missing

The lattice state machine is implemented as a library but not fully integrated as a distinct subsystem with its own API surface for triage workflows
Triage-specific UI for lattice state visualization and manual state overrides
Lattice state persistence and audit trail for state transitions

Implementation Plan

Expose lattice state transitions as an API for triage integration
Build UI for lattice state visualization and manual overrides
Add persistence layer for state transition history and audit trail

Source: See feature catalog

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