feat: Implement distro-native version comparison for RPM, Debian, and Alpine packages
- Add RpmVersionComparer for RPM version comparison with epoch, version, and release handling. - Introduce DebianVersion for parsing Debian EVR (Epoch:Version-Release) strings. - Create ApkVersion for parsing Alpine APK version strings with suffix support. - Define IVersionComparator interface for version comparison with proof-line generation. - Implement VersionComparisonResult struct to encapsulate comparison results and proof lines. - Add tests for Debian and RPM version comparers to ensure correct functionality and edge case handling. - Create project files for the version comparison library and its tests.
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docs/implplan/SPRINT_4300_SUMMARY.md
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# SPRINT_4300 Summary - Explainable Triage Gaps
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## Overview
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This sprint series closes the remaining gaps between the "Designing Explainable Triage and Proof-Linked Evidence" advisory (18-Dec-2025) and the current implementation.
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**Origin Advisory:** `docs/product-advisories/18-Dec-2025 - Designing Explainable Triage and Proof‑Linked Evidence.md`
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**Gap Analysis:** `docs/implplan/analysis/4300_explainable_triage_gap_analysis.md`
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## Executive Summary
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The advisory defined a comprehensive vision for explainable, evidence-linked triage. **~85% was already implemented** through prior sprints (3800, 3801, 4100, 4200 series). This series addresses the remaining **6 gaps**:
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| Gap | Description | Sprint | Priority | Effort |
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|-----|-------------|--------|----------|--------|
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| G1 | CLI attestation chain verify command | 4300.0001.0001 | HIGH | M |
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| G6 | Findings evidence API endpoint | 4300.0001.0002 | MEDIUM | S |
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| G2 | Evidence privacy controls | 4300.0002.0001 | MEDIUM | M |
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| G3 | Evidence TTL enforcement | 4300.0002.0002 | MEDIUM | S |
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| G4 | Predicate JSON schemas | 4300.0003.0001 | LOW | S |
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| G5 | Attestation completeness metrics | 4300.0003.0002 | LOW | M |
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**Total Effort:** ~10-14 days across teams
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## Sprint Structure
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```
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SPRINT_4300 (Explainable Triage Gaps)
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├── 0001 (CLI & API)
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│ ├── 0001 CLI Attestation Verify Command [HIGH]
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│ └── 0002 Findings Evidence API [MEDIUM]
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├── 0002 (Evidence Management)
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│ ├── 0001 Evidence Privacy Controls [MEDIUM]
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│ └── 0002 Evidence TTL Enforcement [MEDIUM]
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└── 0003 (Quality & Observability)
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├── 0001 Predicate JSON Schemas [LOW]
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└── 0002 Attestation Metrics [LOW]
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```
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## Dependencies
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### External Dependencies (Already DONE)
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| Dependency | Sprint | Status |
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|------------|--------|--------|
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| OCI Referrer Discovery | 4100.0003.0002 | DONE |
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| Risk Verdict Attestation | 4100.0003.0001 | DONE |
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| Human Approval Attestation | 3801.0001.0004 | DONE |
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| Approve Button UI | 4100.0005.0001 | DONE |
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| Evidence Composition Service | 3800.0003.0001 | DONE |
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| Boundary Extractors | 3800.0002.* | DONE |
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| Trust Lattice Engine | (core) | DONE |
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### Internal Dependencies
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```
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4300.0001.0001 ─┬─> (none, can start immediately)
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4300.0001.0002 ─┤
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4300.0002.0001 ─┤
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4300.0002.0002 ─┤
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4300.0003.0001 ─┤
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4300.0003.0002 ─┘
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```
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All sprints can run in parallel.
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## Recommended Execution Order
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**Wave 1 (Week 1):** HIGH priority + foundations
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- 4300.0001.0001 - CLI Attestation Verify (CLI Team)
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- 4300.0001.0002 - Findings Evidence API (Scanner Team)
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- 4300.0002.0002 - Evidence TTL Enforcement (Policy Team)
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**Wave 2 (Week 2):** MEDIUM + LOW priority
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- 4300.0002.0001 - Evidence Privacy Controls (Scanner Team)
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- 4300.0003.0001 - Predicate Schemas (Attestor Team)
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- 4300.0003.0002 - Attestation Metrics (Telemetry Team)
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## Success Criteria (from Advisory)
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| # | Criterion | Coverage |
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|---|-----------|----------|
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| 1 | Every risk row expands to path, boundary, VEX, last-seen in <300ms | 4200.0001.0001 (planned) + 4300.0001.0002 |
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| 2 | "Approve" button disabled until SBOM+VEX+Decision attestations validate | 4100.0005.0001 (DONE) |
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| 3 | One-click "Show DSSE chain" renders envelopes with digests and signers | 4200.0001.0001 (planned) |
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| 4 | Audit log captures who approved, which digests, evidence hashes | 3801.0001.0004 (DONE) |
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| 5 | CLI can verify attestation chain before deploy | **4300.0001.0001** |
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| 6 | % attestation completeness >= 95% | **4300.0003.0002** |
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| 7 | TTFE (time-to-first-evidence) <= 30s | **4300.0003.0002** |
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| 8 | Post-deploy reversions trend to zero | **4300.0003.0002** |
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## Team Assignments
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| Team | Sprints | Total Effort |
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|------|---------|--------------|
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| CLI Team | 4300.0001.0001 | M (2-3d) |
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| Scanner Team | 4300.0001.0002, 4300.0002.0001 | S+M (3-5d) |
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| Policy Team | 4300.0002.0002 | S (1-2d) |
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| Attestor Team | 4300.0003.0001 | S (1-2d) |
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| Telemetry Team | 4300.0003.0002 | M (2-3d) |
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## Deliverables
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### New CLI Commands
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- `stella verify image <reference> --require sbom,vex,decision`
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### New API Endpoints
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- `GET /api/v1/findings/{findingId}/evidence`
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- `POST /api/v1/findings/evidence/batch`
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### New Services
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- `ImageAttestationVerifier`
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- `TrustPolicyLoader`
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- `EvidenceRedactionService`
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- `EvidenceTtlEnforcer`
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- `AttestationCompletenessCalculator`
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- `PredicateSchemaValidator`
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### New Metrics
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- `stella_attestations_created_total`
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- `stella_attestations_verified_total`
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- `stella_attestations_failed_total`
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- `stella_ttfe_seconds`
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- `stella_post_deploy_reversions_total`
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### New Schemas
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- `docs/schemas/predicates/sbom.v1.schema.json`
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- `docs/schemas/predicates/vex.v1.schema.json`
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- `docs/schemas/predicates/reachability.v1.schema.json`
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- `docs/schemas/predicates/boundary.v1.schema.json`
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- `docs/schemas/predicates/policy-decision.v1.schema.json`
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- `docs/schemas/predicates/human-approval.v1.schema.json`
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### New Dashboard
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- `deploy/grafana/dashboards/attestation-metrics.json`
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## Risk Register
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| Risk | Impact | Mitigation |
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|------|--------|------------|
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| OCI referrers API not supported by all registries | Fallback tag discovery | Already implemented in 4100.0003.0002 |
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| Schema validation performance | Latency on attestation creation | Cache compiled schemas |
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| Metric cardinality explosion | Prometheus storage | Limit label values |
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## Completion Checklist
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- [ ] All 6 sprints marked DONE
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- [ ] CLI verify command works end-to-end
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- [ ] Evidence API returns advisory-compliant contract
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- [ ] Privacy redaction enforced by default
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- [ ] TTL staleness affects policy decisions
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- [ ] All predicate schemas validate correctly
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- [ ] Grafana dashboard shows all metrics
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- [ ] Integration tests pass
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- [ ] Documentation updated
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## Post-Completion
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After all sprints complete:
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1. Update `docs/09_API_CLI_REFERENCE.md` with new CLI command
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2. Update `docs/modules/scanner/architecture.md` with evidence API
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3. Archive this summary to `docs/implplan/archived/`
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4. Close advisory tracking issue
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---
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**Sprint Series Status:** TODO (0/6 sprints complete)
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**Created:** 2025-12-22
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**Origin:** Gap analysis of 18-Dec-2025 advisory
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