git.stella-ops.org/docs/features/unchecked/signals/runtime-node-hash-evidence-in-signals.md

Runtime Node-Hash Evidence in Signals

Module

Signals

Status

IMPLEMENTED

Description

Runtime signal schemas extended with node-hash inputs, call-stack digests, and path hashes for deterministic joins with static reachability evidence.

Implementation Details

• Modules: src/Signals/StellaOps.Signals/Lattice/, src/Signals/StellaOps.Signals/Services/, src/Signals/StellaOps.Signals/Models/
• Key Classes:
  • ReachabilityLattice (src/Signals/StellaOps.Signals/Lattice/ReachabilityLattice.cs) - lattice-based reachability state combining static and runtime evidence
  • ReachabilityLatticeState (src/Signals/StellaOps.Signals/Lattice/ReachabilityLatticeState.cs) - state model with node-hash and path-hash inputs
  • UncertaintyTier (src/Signals/StellaOps.Signals/Lattice/UncertaintyTier.cs) - uncertainty tier classification for reachability evidence
  • ReachabilityFactDigestCalculator (src/Signals/StellaOps.Signals/Services/ReachabilityFactDigestCalculator.cs) - calculates deterministic digests for reachability facts
  • ReachabilityFactDocument (src/Signals/StellaOps.Signals/Models/ReachabilityFactDocument.cs) - document model with node-hash and call-stack digest fields
• Source: SPRINT_20260112_005_SIGNALS_runtime_nodehash.md

E2E Test Plan

• Ingest a runtime signal with node-hash evidence and verify ReachabilityFactDigestCalculator produces a deterministic digest
• Join runtime evidence with static reachability facts using node-hash and verify the join is correct
• Verify call-stack digest: capture a runtime call stack and confirm the digest matches the expected value
• Verify path hash: compute path hashes for runtime traces and confirm they match static analysis paths
• Verify ReachabilityLattice correctly merges runtime and static evidence into a combined reachability state