This sprint batch implemented the foundational reproducibility and provenance infrastructure for StellaOps, enabling deterministic policy decisions, verifiable attestations, and efficient caching for offline/air-gap scenarios.

Sprint Completion Status

Sprint	Topic	Status	Tasks
8200.0001.0001	Verdict ID Content-Addressing	✅ COMPLETE	12/12 DONE
8200.0001.0001	Provcache Core Backend	✅ COMPLETE	44/44 DONE
8200.0001.0002	DSSE Round-Trip Testing	✅ COMPLETE	20/20 DONE
8200.0001.0002	Provcache Invalidation & Air-Gap	🟡 90% COMPLETE	50/56 DONE, 6 BLOCKED
8200.0001.0003	Provcache UX & Observability	✅ COMPLETE	56/56 DONE
8200.0001.0003	SBOM Schema Validation CI	✅ COMPLETE	17/17 DONE
8200.0001.0004	E2E Reproducibility Test	✅ COMPLETE	26/26 DONE
8200.0001.0005	Sigstore Bundle Implementation	🟡 79% COMPLETE	19/24 DONE, 1 N/A, 4 BLOCKED
8200.0001.0006	Budget Threshold Attestation	🟡 61% COMPLETE	11/18 DONE, 1 N/A, 6 BLOCKED

Total: 255/273 tasks DONE (93%), 2 N/A, 16 BLOCKED

Key Deliverables

1. Verdict ID Content-Addressing (Sprint 0001/Verdict)

VerdictIdGenerator with SHA-256 content-addressed IDs
Deterministic verdict hashing across runs
14 unit tests validating stability

2. Provcache Core Backend (Sprint 0001/Provcache)

VeriKey composite hash (source, SBOM, VEX, policy, signer, time)
DecisionDigest wrapping TrustLattice output
Valkey read-through cache with Postgres write-behind
/v1/provcache/* API endpoints
Policy engine integration with bypass support
OpenTelemetry traces and Prometheus metrics

3. DSSE Round-Trip Testing (Sprint 0002/DSSE)

Sign → serialize → deserialize → re-bundle → verify tests
Cosign compatibility with mock Fulcio/Rekor
Multi-signature envelope support
55+ determinism and negative tests

4. Provcache Invalidation & Air-Gap (Sprint 0002/Provcache)

Signer revocation fan-out via SignerRevokedEvent
Feed epoch binding via FeedEpochAdvancedEvent
Evidence chunk storage with Merkle verification
Minimal proof export (lite/standard/strict density)
CLI commands: stella prov export/import/verify
Lazy evidence fetch for air-gap

5. Provcache UX & Observability (Sprint 0003/Provcache)

ProvenanceBadgeComponent (cached/computed/stale/unknown)
TrustScoreDisplayComponent with donut chart
ProofTreeComponent with collapsible Merkle tree
InputManifestComponent showing decision inputs
Grafana dashboards (hit rate, latency, invalidations)
OCI attestation attachment (stella.ops/provcache@v1)

6. SBOM Schema Validation CI (Sprint 0003/Schema)

CycloneDX 1.6, SPDX 3.0.1, OpenVEX 0.2.0 schemas
Validation scripts and CI workflow
Golden corpus validation on every PR

7. E2E Reproducibility Test (Sprint 0004)

Full pipeline: ingest → normalize → diff → decide → attest → bundle
Cross-platform verification (Linux/Windows/macOS)
Golden baseline with expected hashes
Nightly reproducibility gate

8. Sigstore Bundle (Sprint 0005)

Sigstore Bundle v0.3 models and serialization
Certificate chain and Merkle proof verification
DSSE signature verification (ECDSA/Ed25519/RSA)
36 unit tests

9. Budget Threshold Attestation (Sprint 0006)

BudgetCheckPredicate with environment, limits, counts
Deterministic config hash for reproducibility
VerdictPredicateBuilder integration
12 unit tests

Blocked Tasks (Follow-Up Required)

Cross-Module Integration (Signer → Provcache)

PROV-8200-101: Publish SignerRevokedEvent from KeyRotationService.RevokeKey()
PROV-8200-105, 106: SignerSetInvalidator DI and tests

Service Integration

PROV-8200-112, 113: FeedEpochInvalidator DI and tests
PROV-8200-143: CLI e2e tests (requires deployed services)

Attestor Integration

BUNDLE-8200-016-018, 022: Sigstore Bundle integration with AttestorBundleService, ExportCenter, CLI
BUDGET-8200-008-010, 014-016: BudgetCheckStatement and DSSE envelope integration

Files Changed

New Projects: StellaOps.Provcache, StellaOps.Attestor.Bundle
Documentation: docs/modules/provcache/, docs/modules/attestor/, docs/testing/
CI/CD: .gitea/workflows/schema-validation.yml, .gitea/workflows/e2e-reproducibility.yml
Deploy: deploy/grafana/dashboards/provcache-overview.json

Next Steps

Create follow-up sprint for Signer module to publish SignerRevokedEvent
Create follow-up sprint for service-level DI registration of invalidators
Create follow-up sprint for Attestor integration with Sigstore Bundle and Budget attestation
Run full E2E reproducibility test in CI to validate cross-platform determinism