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Reachability Analysis Technical Reference

Source Advisories:

05-Dec-2025 - Building a Deterministic, Reachability‑First Architecture
13-Dec-2025 - Designing the Call‑Stack Reachability Engine
03-Dec-2025 - Reachability Benchmarks and Moat Metrics
09-Dec-2025 - Caching Reachability the Smart Way
04-Dec-2025 - Ranking Unknowns in Reachability Graphs
02-Dec-2025 - Designing Deterministic Reachability UX
05-Dec-2025 - Design Notes on Smart‑Diff and Call‑Stack Analysis

Last Updated: 2025-12-14

1. ARCHITECTURE PATTERNS

1.1 Core System Architecture

Module Responsibilities

StellaOps.Scanner.WebService: Authoritative for reachability pipeline and lattice computation
Language workers: Stateless compute producing CallGraph.v1.json
Runtime collectors: Agent/sidecar emitting evidence events only
Concelier/Excititor: Provide pruned sources; never compute reachability
Authority: Manages replay manifests, crypto profiles
Scheduler: Executes rescan/escalation policies

Architectural Rules

Scanner = origin of truth for reachability
Concelier/Vexer = prune-preservers only
Authority = replay manifest owner
Scheduler = executor of policies
Postgres = System of Record (SoR)
Valkey = ephemeral only (dedupe, hot cache, rate limits)

1.2 Evidence Graph Structure

Node Types

Artifact, Component, Vulnerability, Attestation, Build, Deployment, RuntimeSignal

Edge Types

DESCRIBES, AFFECTS, NOT_AFFECTED_BY, FIXED_IN, DERIVED_FROM, DEPLOYS, OBSERVED_AT_RUNTIME

Edge Signing

Sign edges, not just nodes (edge = claim)

1.3 Determinism Requirements

Input Manifest Structure

{
  "scannerVersion": "1.3.0",
  "rulesetId": "stella-default-2025.11",
  "feeds": {
    "nvdDigest": "sha256:...",
    "osvDigest": "sha256:..."
  },
  "sbomDigest": "sha256:...",
  "policyDigest": "sha256:..."
}

Canonicalization Rules

Sort arrays by stable keys
Normalize paths (POSIX style)
Line endings (LF)
Encodings (UTF-8)
No environment variables in core algorithms
No machine-local files
No system clock inside algorithms

2. DATA CONTRACTS

2.1 CallGraph.v1.json Schema

{
  "schema": "stella.callgraph.v1",
  "scanKey": "uuid",
  "language": "dotnet|java|node|python|go|rust|binary",
  "artifacts": [{
    "artifactKey": "…",
    "kind": "assembly|jar|module|binary",
    "sha256": "…"
  }],
  "nodes": [{
    "nodeId": "…",
    "artifactKey": "…",
    "symbolKey": "Namespace.Type::Method(…)",
    "visibility": "public|internal|private|unknown",
    "isEntrypointCandidate": false
  }],
  "edges": [{
    "from": "nodeId",
    "to": "nodeId",
    "kind": "static|heuristic",
    "reason": "direct_call|virtual_call|reflection_string|di_binding|dynamic_import|unknown",
    "weight": 1.0
  }],
  "entrypoints": [{
    "nodeId": "…",
    "kind": "http|grpc|cli|job|event|unknown",
    "route": "/api/orders/{id}",
    "framework": "aspnetcore|minimalapi|spring|express|unknown"
  }]
}

2.2 RuntimeEvidence.v1.json Schema

{
  "schema": "stella.runtimeevidence.v1",
  "scanKey": "uuid",
  "collectedAt": "2025-12-14T10:00:00Z",
  "environment": {
    "os": "linux|windows",
    "k8s": {"namespace": "…", "pod": "…", "container": "…"},
    "imageDigest": "sha256:…",
    "buildId": "…"
  },
  "samples": [{
    "timestamp": "…",
    "pid": 1234,
    "threadId": 77,
    "frames": ["nodeId","nodeId","nodeId"],
    "sampleWeight": 1.0
  }],
  "loadedArtifacts": [{
    "artifactKey": "…",
    "evidence": "loaded_module|mapped_file|jar_loaded"
  }]
}

2.3 ReplayManifest.json Schema

{
  "schema": "stella.replaymanifest.v1",
  "scanId": "uuid",
  "inputs": {
    "sbomDigest": "sha256:…",
    "callGraphs": [{"language":"dotnet","digest":"sha256:…"}],
    "runtimeEvidence": [{"digest":"sha256:…"}],
    "concelierSnapshot": "sha256:…",
    "excititorSnapshot": "sha256:…",
    "policyDigest": "sha256:…"
  }
}

2.4 ProofSpine Data Model

public sealed record ProofSpine(
    string SpineId,
    string ArtifactId,
    string VulnerabilityId,
    string PolicyProfileId,
    IReadOnlyList<ProofSegment> Segments,
    string Verdict,
    string VerdictReason,
    string RootHash,
    string ScanRunId,
    DateTimeOffset CreatedAt,
    string? SupersededBySpineId
);

public sealed record ProofSegment(
    string SegmentId,
    string SegmentType,
    int Index,
    string InputHash,
    string ResultHash,
    string? PrevSegmentHash,
    DsseEnvelope Envelope,
    string ToolId,
    string ToolVersion,
    string Status
);

Segment Types

SBOM_SLICE: Component relevance
MATCH: SBOM-to-vuln mapping
REACHABILITY: Symbol reachability
GUARD_ANALYSIS: Config/feature flag gates
RUNTIME_OBSERVATION: Runtime evidence
POLICY_EVAL: Lattice decision

3. DATABASE SCHEMAS

3.1 Core Reachability Tables (Postgres)

-- Scan tracking
CREATE TABLE scan (
    scan_id uuid PRIMARY KEY,
    created_at timestamptz,
    repo_uri text,
    commit_sha text,
    sbom_digest text,
    policy_digest text,
    status text
);
CREATE INDEX idx_scan_cache ON scan(commit_sha, sbom_digest);

-- Artifacts
CREATE TABLE artifact (
    artifact_id uuid PRIMARY KEY,
    scan_id uuid REFERENCES scan,
    artifact_key text,
    kind text,
    sha256 text,
    build_id text,
    purl text,
    UNIQUE(scan_id, artifact_key)
);

-- Call graph nodes
CREATE TABLE cg_node (
    scan_id uuid,
    node_id text,
    artifact_key text,
    symbol_key text,
    visibility text,
    flags int,
    PRIMARY KEY(scan_id, node_id)
);

-- Call graph edges
CREATE TABLE cg_edge (
    scan_id uuid,
    from_node_id text,
    to_node_id text,
    kind smallint,
    reason smallint,
    weight real,
    PRIMARY KEY(scan_id, from_node_id, to_node_id, kind, reason)
);
CREATE INDEX idx_cg_edge_from ON cg_edge(scan_id, from_node_id);
CREATE INDEX idx_cg_edge_to ON cg_edge(scan_id, to_node_id);

-- Entrypoints
CREATE TABLE entrypoint (
    scan_id uuid,
    node_id text,
    kind text,
    framework text,
    route text,
    PRIMARY KEY(scan_id, node_id, kind, framework, route)
);

-- Runtime samples
CREATE TABLE runtime_sample (
    scan_id uuid,
    collected_at timestamptz,
    env_hash text,
    sample_id bigserial PRIMARY KEY,
    timestamp timestamptz,
    pid int,
    thread_id int,
    frames text[],
    weight real
);

-- Symbol-to-component mapping
CREATE TABLE symbol_component_map (
    scan_id uuid,
    node_id text,
    purl text,
    mapping_kind text,
    confidence real,
    PRIMARY KEY(scan_id, node_id, purl)
);

-- Reachability results
CREATE TABLE reachability_component (
    scan_id uuid,
    purl text,
    status smallint,
    confidence real,
    why jsonb,
    evidence jsonb,
    PRIMARY KEY(scan_id, purl)
);

CREATE TABLE reachability_finding (
    scan_id uuid,
    cve_id text,
    purl text,
    status smallint,
    confidence real,
    why jsonb,
    evidence jsonb,
    PRIMARY KEY(scan_id, cve_id, purl)
);

3.2 Unknowns Ranking Tables

CREATE TABLE unknowns (
    unknown_id uuid PRIMARY KEY,
    pkg_id text,
    pkg_version text,
    digest_anchor bytea,
    unknown_flags jsonb,
    popularity_p float,
    potential_e float,
    uncertainty_u float,
    centrality_c float,
    staleness_s float,
    score float,
    band text CHECK(band IN ('HOT','WARM','COLD')),
    graph_slice_hash bytea,
    evidence_set_hash bytea,
    normalization_trace jsonb,
    callgraph_attempt_hash bytea,
    created_at timestamptz,
    updated_at timestamptz
);

CREATE TABLE deploy_refs (
    pkg_id text,
    image_id text,
    env text,
    first_seen timestamptz,
    last_seen timestamptz
);

CREATE TABLE graph_metrics (
    pkg_id text PRIMARY KEY,
    degree_c float,
    betweenness_c float,
    last_calc_at timestamptz
);

3.3 Proof Spine Tables

CREATE TABLE proof_spines (
    spine_id uuid PRIMARY KEY,
    artifact_id text,
    vuln_id text,
    policy_profile_id text,
    verdict text,
    verdict_reason text,
    root_hash text,
    scan_run_id uuid,
    created_at timestamptz,
    superseded_by_spine_id uuid,
    segment_count int
);
CREATE INDEX idx_spine_lookup ON proof_spines(artifact_id, vuln_id, policy_profile_id);

CREATE TABLE proof_segments (
    segment_id uuid PRIMARY KEY,
    spine_id uuid REFERENCES proof_spines,
    idx int,
    segment_type text,
    input_hash text,
    result_hash text,
    prev_segment_hash text,
    envelope bytea,
    tool_id text,
    tool_version text,
    status text,
    created_at timestamptz
);

4. ALGORITHMS

4.1 Reachability Status Classification

Status Values

UNREACHABLE: No path from entrypoints
POSSIBLY_REACHABLE: Graph incomplete/dynamic behavior
REACHABLE_STATIC: Static path exists
REACHABLE_PROVEN: Runtime evidence confirms

Confidence Scoring (Deterministic)

Base scores:

UNREACHABLE → 0.05
POSSIBLY_REACHABLE → 0.35
REACHABLE_STATIC → 0.70
REACHABLE_PROVEN → 0.95

Modifiers:

+0.10 if path uses only static edges
-0.15 if path includes reflection_string|dynamic_import
+0.10 if runtime evidence hits affected component
-0.10 if NO_ENTRYPOINTS_DISCOVERED
Clamp to [0, 1]

4.2 Reachability Computation Algorithm

Inputs:
- Call graph nodes/edges + entrypoints
- Runtime evidence (optional)
- SBOM with purls
- Vulnerability facts (CVE ↔ purl/version)
- VEX statements

Steps:
1. Build adjacency list for cg_edge.kind in (static, heuristic)
2. Optional: Compress SCCs (Tarjan/Kosaraju)
3. Seed from entrypoints; if empty → mark POSSIBLY_REACHABLE with NO_ENTRYPOINTS_DISCOVERED
4. Traverse reachable nodes; track:
   - firstSeenFromEntrypoint[node]
   - pathWitness[node]
5. Map reachable nodes to purls via symbol_component_map:
   Priority order:
   a. Exact binary symbol → package metadata
   b. Assembly/jar/module to SBOM component (hash/purl)
   c. Heuristics: namespace prefixes, import paths, jar manifest
6. Runtime evidence upgrade:
   - Mark frame nodes as "executed"
   - Mint runtime edges: consecutive frames → runtime_minted
   - Upgrade to REACHABLE_PROVEN if executed node maps to affected purl
7. Compute confidence using deterministic formula

4.3 Unknowns Ranking Algorithm

Score Formula

Score = clamp01(
    wP·P  +  # Popularity impact
    wE·E  +  # Exploit consequence potential
    wU·U  +  # Uncertainty density
    wC·C  +  # Graph centrality
    wS·S     # Evidence staleness
)

Default Weights

wP = 0.25  (deployment impact)
wE = 0.25  (potential consequence)
wU = 0.25  (uncertainty density)
wC = 0.15  (graph centrality)
wS = 0.10  (evidence staleness)

Heuristics

P = min(1, log10(1 + deployments)/log10(1 + 100))
U = sum of flags, capped at 1.0:
    +0.30 if no provenance anchor
    +0.25 if version_range
    +0.20 if conflicting_feeds
    +0.15 if missing_vector
    +0.10 if unreachable source advisory
S = min(1, age_days / 14)

Band Assignment

Score ≥ 0.70 → HOT (immediate rescan + VEX escalation)
0.40 ≤ Score < 0.70 → WARM (scheduled rescan 12-72h)
Score < 0.40 → COLD (weekly batch)

4.4 Node ID Computation (.NET)

Primary (IL-based)

nodeId = SHA256(MVID + ":" + metadataToken + ":" + arity + ":" + signatureShape)

Fallback (source-only)

nodeId = SHA256(projectPath + ":" + file + ":" + span + ":" + symbolDisplayString)

External nodes

nodeId = SHA256("ext:" + artifactKey + ":" + symbolKey)

4.5 Canonical Symbol Key Format

{Namespace}.{TypeName}[`Arity][+Nested]::{MethodName}[`Arity]({ParamType1},{ParamType2},...)

Rules:

Use System.* full names for BCL types
Use + for nested types (metadata style)
Use backtick arity for generic type/method definitions
Arrays: System.String[]
Byref: System.String&

4.6 Reachability Cache Algorithm

public readonly record struct ReachKey(
    string AlgoSig,        // e.g., "RTA@sha256:…"
    string InputsHash,     // SBOM slice + policy + versions
    string CallPathHash    // normalized query graph
);

public sealed class ReachCache {
    private readonly ConcurrentDictionary<ReachKey, Lazy<Task<ReachResult>>> _memo = new();

    public Task<ReachResult> GetOrComputeAsync(
        ReachKey key,
        Func<Task<ReachResult>> compute,
        CancellationToken ct)
    {
        var lazy = _memo.GetOrAdd(key, _ => new Lazy<Task<ReachResult>>(
            () => compute(), LazyThreadSafetyMode.ExecutionAndPublication));

        return lazy.Value.ContinueWith(t => {
            if (t.IsCompletedSuccessfully) return t.Result;
            _memo.TryRemove(key, out _);
            throw t.Exception ?? new Exception("reachability failed");
        }, ct);
    }
}

Operational rules

Canonical everything: sort nodes/edges, normalize paths
Cache scope: per-scan, per-workspace, or per-feed version
TTL: 15-60 minutes or evict after pipeline completes
Max-entries cap
Concurrency: Lazy<Task<>> coalesces duplicate in-flight calls

4.7 Proof Spine Construction

1. Sbomer produces SBOM_SLICE segment, DSSE-signs it
2. Scanner produces MATCH segment
3. Reachability produces REACHABILITY segment
4. Guard Analyzer produces GUARD_ANALYSIS segment
5. Vexer evaluates lattice, produces POLICY_EVAL segment
6. ProofSpineBuilder:
   - Sorts segments by predetermined order
   - Chains PrevSegmentHash
   - Computes RootHash = hash(concat of segment hashes)
   - Stores ProofSpine with deterministic SpineId

5. API CONTRACTS

5.1 Scanner Ingestion Endpoints

POST /api/scans
  Returns: scanId

POST /api/scans/{scanId}/callgraphs
  Body: CallGraph.v1.json
  Header: Content-Digest (for idempotency)

POST /api/scans/{scanId}/runtimeevidence
  Body: RuntimeEvidence.v1.json

POST /api/scans/{scanId}/sbom
  Body: CycloneDX/SPDX

POST /api/scans/{scanId}/compute-reachability
  Idempotent trigger

5.2 Query Endpoints

GET /api/scans/{scanId}/reachability/components?purl=...
GET /api/scans/{scanId}/reachability/findings?cve=...
GET /api/scans/{scanId}/reachability/explain?cve=...&purl=...
  Returns: why[], path witness, sample refs

5.3 Export Endpoints

GET /api/scans/{scanId}/exports/sarif
GET /api/scans/{scanId}/exports/cdxr  # CycloneDX reachability extension
GET /api/scans/{scanId}/exports/openvex

5.4 Proof Spine Endpoints

GET /graph/runtime/{podId}/lineage
GET /graph/image/{digest}/vex
GET /spines/{spineId}
  Returns: ProofSpine with all segments

6. .NET IMPLEMENTATION PATTERNS

6.1 .NET Worker (Roslyn + IL) Required Features

Call Graph Extraction

Direct invocation edges: InvocationExpressionSyntax
Object creation edges: constructors
Delegate invocation: record heuristic edge when target unresolved
Virtual/interface dispatch: record virtual_call edge to declared method
Async/await: connect logical caller → awaited method

Entrypoint Discovery

Program.Main (classic)
ASP.NET Core:
- Controllers: [ApiController], route attributes, action methods
- Minimal APIs: MapGet/MapPost/MapMethods patterns
- gRPC: MapGrpcService<T>() and service methods
- Hosted services: IHostedService, BackgroundService.ExecuteAsync

Reflection and DI Heuristics

Type.GetType("…"), Assembly.GetType, GetMethod("…"), Invoke
services.AddTransient<IFoo,Foo>() / AddScoped / AddSingleton
Activator.CreateInstance, ServiceProvider.GetService
Produce heuristic edges with reason = di_binding or reflection_string

6.2 NuGet Dependencies

<!-- Roslyn / MSBuild -->
<PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="5.0.0" />
<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
<PackageReference Include="Microsoft.Build.Locator" Version="*" />

<!-- IL + metadata -->
<!-- Use System.Reflection.Metadata (BCL) -->
<!-- Optional: Mono.Cecil for faster IL traversal -->

<!-- CLI + JSON -->
<PackageReference Include="System.CommandLine" Version="*" />
<PackageReference Include="System.Text.Json" Version="*" />

6.3 Roslyn IL Opcodes for Call Detection

Recognize as "calls":
- call
- callvirt
- newobj
- jmp
- ldftn
- ldvirtftn

6.4 MSBuild Workspace Loading Pattern

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.MSBuild;

var ws = MSBuildWorkspace.Create();
var sln = await ws.OpenSolutionAsync(@"path\to.sln");
foreach (var proj in sln.Projects)
foreach (var doc in proj.Documents)
{
    var model = await doc.GetSemanticModelAsync();
    var root = await doc.GetSyntaxRootAsync();
    foreach (var node in root.DescendantNodes()
        .OfType<InvocationExpressionSyntax>())
    {
        var sym = model.GetSymbolInfo(node).Symbol as IMethodSymbol;
        if (sym != null)
        {
            // record edge: caller -> sym
        }
    }
}

7. CONFIGURATION PATTERNS

7.1 Crypto Profiles

public interface ICryptoProfile
{
    string ProfileId { get; }
    byte[] Sign(byte[] data, string keyId);
    bool Verify(byte[] data, byte[] signature, string keyId);
}

// Implementations: FipsProfile, GostProfile, EidasProfile, SmProfile, PqcProfile

Profile Metadata

Algorithm
Key ID
Profile name

Key Rotation

Keys have validity intervals
Spines keep KeyId in each DSSE signature
Authority maintains trust table: which keys trusted for which SegmentType and time window

7.2 Offline Bundle Format

Required Contents

SBOM + feeds + policy bundle + key material
Manifest with hashes of all contents
Replay manifest for deterministic rerun

Format

Zip/tar + manifest
Each entry content-addressed

7.3 Cache Configuration (appsettings)

{
  "Scanner": {
    "Reach": {
      "Cache": {
        "MaxEntries": 10000,
        "TtlMinutes": 60,
        "EvictOnPipelineComplete": true
      }
    }
  }
}

8. METRICS AND THRESHOLDS

8.1 Performance SLOs (v1)

Medium service (100k LOC .NET) static graph: < 2 minutes
Reachability compute: < 30 seconds
Query GET finding: < 200ms p95

8.2 Quality Metrics

Proof verification

% verified proofs
Proof verification failures
Proof age since last verification
% entries with valid inclusion proof (Rekor)

Unknowns triage

Hot/Warm/Cold distribution
Rescan success rate after N attempts
Evidence staleness distribution

Drift detection

Runtime edges not in static graph (above threshold → emit COVERAGE_DRIFT warning)

8.3 Benchmark Metrics (Moat)

Metric	Target
Time-to-evidence: SBOM → signed call-graph	< 5 minutes for 100k LOC service
SBOM-diff false positive rate under dependency churn	< 5% change in reachability status for non-code changes
Deterministic priority scoring under air-gap replay	Bit-identical results given same inputs
Proof verification time	< 200ms p95

9. TESTING PATTERNS

9.1 Golden Corpus Requirements

Mandatory Test Cases

Minimal ASP.NET controller with reachable endpoint → vulnerable lib call
Vulnerable lib present but never called → unreachable
Reflection-based activation → "possible" unless runtime proves
BackgroundService job case
Version range ambiguity
Mismatched epoch/backport
Missing CVSS vector
Conflicting severity vendor/NVD
Unanchored filesystem library

Assertions per Test

Reachability status
At least one why[] reason
Deterministic confidence within ±0.01
Segments with expected status (verified/partial/invalid)

9.2 Replay Manifest Tests

Given manifest containing:

feed hashes
rules version
normalization logic
lattice rules

Assert: ranking/reachability recomputes identically (byte-for-byte)

9.3 Signature Tampering Tests

Flip byte in DSSE payload → UI must show invalid
Mark key untrusted → segments show untrusted-key
Entire spine marked as compromised

10. SPECIFICATION COMPLIANCE

10.1 SBOM Standards

CycloneDX

Version: 1.6 (ECMA-424) and 1.7 (current)
Media type: include version parameter
Ingest: validate against ECMA-424/1.7 schemas

SPDX

Version: 3.0.1
Validate against canonical spec

Ingestion Rules

Accept only *.cdx.json and *.spdx.json
Hard fail others
Store: raw bytes + parsed form + normalized canonical form

10.2 VEX Standards

OpenVEX

Minimal, SBOM-agnostic
Predicate type: https://openvex.dev/ns/v0.2.0

CSAF VEX

Alternative format for interoperability

Required VEX Fields

status: not_affected|affected|fixed|under_investigation
justification
timestamp
author
link to supporting evidence

10.3 Attestation Standards

DSSE (Dead Simple Signing Envelope)

Use for all signed artifacts
Payload: canonical JSON
Envelope: signature + key metadata + profile

in-toto

Statement structure
Predicate types:
- SBOM: https://spdx.dev/Document
- VEX: OpenVEX predicate URI
- Custom: reachability predicates

Cosign Integration

cosign attest --yes --type https://spdx.dev/Document \
  --predicate sbom.spdx.json \
  --key cosign.key \
  "${IMAGE_DIGEST}"

10.4 Rekor Integration

CLI Verification

rekor-cli verify --rekor_server https://rekor.sigstore.dev \
  --signature artifact.sig \
  --public-key cosign.pub \
  --artifact artifact.bin

Persistence per Entry

Rekor UUID
Log index
Integrated time
Inclusion proof data

11. CLI COMMANDS

11.1 Worker CLI

# Artifacts-first scan
stella-worker-dotnet scan \
  --scanKey 00000000-0000-0000-0000-000000000000 \
  --assemblies ./artifacts/bin/Release \
  --out ./callgraph.json

# Build-and-scan
stella-worker-dotnet scan \
  --scanKey ... \
  --sln ./src/MySolution.sln \
  --configuration Release \
  --tfm net10.0 \
  --buildMode build \
  --out ./callgraph.json

# Upload to scanner.webservice
stella-worker-dotnet scan \
  --scanKey ... \
  --assemblies ./artifacts/bin/Release \
  --upload https://scanner/api/scans/{scanId}/callgraphs \
  --apiKey $STELLA_API_KEY

11.2 Replay CLI

stellaops scan \
  --replay-manifest <id-or-file> \
  --artifact <image-digest> \
  --vuln <cve> \
  --explain

11.3 Reachability Query CLI

stella scan graph --lang dotnet --sln path.sln --out graph.scc.json
stella scan runtime --target pod/myservice --duration 30s --out stacks.json
stella reachability join \
  --graph graph.scc.json \
  --runtime stacks.json \
  --sbom bom.cdx.json \
  --out reach.cdxr.json

12. DEVELOPER CHECKLIST

12.1 Per-Feature Definition of Done

For any feature touching scans, VEX, or evidence:

Deterministic: input manifest defined, canonicalization applied, golden fixture(s) added
Evidence: outputs DSSE-wrapped and linked
Reachability/Lattice: runs only in allowed services, records algorithm IDs
Crypto: calls through profile abstraction, tests for ≥2 profiles
Graph: lineage edges added, node/edge IDs stable and queryable
UX/API: API to retrieve structured evidence
Tests: unit + golden + integration test with full SBOM → scan → VEX chain

12.2 Determinism Checklist

Input manifest type defined and versioned
Canonicalization applied before hashing/signing
Output stored with inputsDigest and algoDigest
At least one golden fixture proves determinism
No environment variables in core algorithm
No machine-local files
No system clock inside algorithms

12.3 Reachability Implementation Checklist

Reachability algorithms only in Scanner.WebService
Cache lazy and keyed by deterministic inputs
Output includes explicit evidence pointers
UI endpoints expose reachability state in structured form
All modifiers recorded in why[]

12.4 Crypto-Sovereign Checklist

No direct crypto calls in feature code; only via profile layer
All attestations carry algorithm + key id + profile
Offline bundle type exists for this workflow
Tests for at least 2 different crypto profiles

12.5 Policy/Lattice Checklist

Facts and policies serialized separately
Lattice code in allowed services only
Merge strategies named and versioned
Artifacts record which lattice algorithm used

12.6 Proof-Linked VEX Checklist

VEX schema includes pointers to all upstream artifacts (sbomDigest, scanId, reachMapDigest, policyDigest, signerKeyId)
No duplication of SBOM/scan content inside VEX
DSSE used as standard envelope type

12.7 Unknowns Triage Checklist

Persist all traces for deterministic replay
Ranking depends only on manifest-declared parameters
All uncertainty factors are explicit flags
Scoring reproducible under identical inputs
Scheduler decision table deterministic and tested
API exposes full reasoning

Document Version: 1.0 Target Platform: .NET 10, PostgreSQL ≥16, Angular v17

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