feat: Add Go module and workspace test fixtures

- Created expected JSON files for Go modules and workspaces.
- Added go.mod and go.sum files for example projects.
- Implemented private module structure with expected JSON output.
- Introduced vendored dependencies with corresponding expected JSON.
- Developed PostgresGraphJobStore for managing graph jobs.
- Established SQL migration scripts for graph jobs schema.
- Implemented GraphJobRepository for CRUD operations on graph jobs.
- Created IGraphJobRepository interface for repository abstraction.
- Added unit tests for GraphJobRepository to ensure functionality.

deploy/compose/env/cas.env.example

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+# CAS (Content Addressable Storage) Environment Configuration
+# Copy to .env and customize for your deployment
+#
+# Aligned with best-in-class vulnerability scanner retention policies:
+# - Trivy: 7 days vulnerability DB
+# - Grype: 5 days DB, configurable
+# - Anchore Enterprise: 90-365 days typical
+# - Snyk Enterprise: 365 days
+
+# =============================================================================
+# DATA PATHS (ensure directories exist with proper permissions)
+# =============================================================================
+CAS_DATA_PATH=/var/lib/stellaops/cas
+CAS_EVIDENCE_PATH=/var/lib/stellaops/evidence
+CAS_ATTESTATION_PATH=/var/lib/stellaops/attestations
+
+# =============================================================================
+# RUSTFS CONFIGURATION
+# =============================================================================
+RUSTFS_LOG_LEVEL=info
+RUSTFS_COMPRESSION=zstd
+RUSTFS_COMPRESSION_LEVEL=3
+
+# =============================================================================
+# PORTS
+# =============================================================================
+RUSTFS_CAS_PORT=8180
+RUSTFS_EVIDENCE_PORT=8181
+RUSTFS_ATTESTATION_PORT=8182
+
+# =============================================================================
+# ACCESS CONTROL - API KEYS
+# IMPORTANT: Change these in production!
+# =============================================================================
+
+# CAS Storage (mutable, lifecycle-managed)
+RUSTFS_CAS_API_KEY=cas-api-key-CHANGE-IN-PRODUCTION
+RUSTFS_CAS_READONLY_KEY=cas-readonly-key-CHANGE-IN-PRODUCTION
+
+# Evidence Storage (immutable)
+RUSTFS_EVIDENCE_API_KEY=evidence-api-key-CHANGE-IN-PRODUCTION
+RUSTFS_EVIDENCE_READONLY_KEY=evidence-readonly-key-CHANGE-IN-PRODUCTION
+
+# Attestation Storage (immutable)
+RUSTFS_ATTESTATION_API_KEY=attestation-api-key-CHANGE-IN-PRODUCTION
+RUSTFS_ATTESTATION_READONLY_KEY=attestation-readonly-key-CHANGE-IN-PRODUCTION
+
+# =============================================================================
+# SERVICE ACCOUNT KEYS
+# Each service has its own key for fine-grained access control
+# IMPORTANT: Generate unique keys per environment!
+# =============================================================================
+
+# Scanner service - access to scanner artifacts, surface cache, runtime facts
+RUSTFS_SCANNER_KEY=scanner-svc-key-GENERATE-UNIQUE
+# Bucket access: scanner-artifacts (rw), surface-cache (rw), runtime-facts (rw)
+
+# Signals service - access to runtime facts, signals data, provenance feed
+RUSTFS_SIGNALS_KEY=signals-svc-key-GENERATE-UNIQUE
+# Bucket access: runtime-facts (rw), signals-data (rw), provenance-feed (rw)
+
+# Replay service - access to replay bundles, inputs lock files
+RUSTFS_REPLAY_KEY=replay-svc-key-GENERATE-UNIQUE
+# Bucket access: replay-bundles (rw), inputs-lock (rw)
+
+# Ledger service - access to evidence bundles, merkle roots, hash chains
+RUSTFS_LEDGER_KEY=ledger-svc-key-GENERATE-UNIQUE
+# Bucket access: evidence-bundles (rw), merkle-roots (rw), hash-chains (rw)
+
+# Exporter service - read-only access to evidence bundles
+RUSTFS_EXPORTER_KEY=exporter-svc-key-GENERATE-UNIQUE
+# Bucket access: evidence-bundles (r)
+
+# Attestor service - access to attestations, DSSE envelopes, Rekor receipts
+RUSTFS_ATTESTOR_KEY=attestor-svc-key-GENERATE-UNIQUE
+# Bucket access: attestations (rw), dsse-envelopes (rw), rekor-receipts (rw)
+
+# Verifier service - read-only access to attestations
+RUSTFS_VERIFIER_KEY=verifier-svc-key-GENERATE-UNIQUE
+# Bucket access: attestations (r), dsse-envelopes (r), rekor-receipts (r)
+
+# Global read-only key (for debugging/auditing)
+RUSTFS_READONLY_KEY=readonly-global-key-GENERATE-UNIQUE
+# Bucket access: * (r)
+
+# =============================================================================
+# LIFECYCLE MANAGEMENT
+# =============================================================================
+# Cron schedule for retention policy enforcement (default: 3 AM daily)
+LIFECYCLE_CRON=0 3 * * *
+LIFECYCLE_TELEMETRY=true
+
+# =============================================================================
+# RETENTION POLICIES (days, 0 = indefinite)
+# Aligned with enterprise vulnerability scanner best practices
+# =============================================================================
+# Vulnerability DB: 7 days (matches Trivy default, Grype uses 5)
+CAS_RETENTION_VULNERABILITY_DB_DAYS=7
+
+# SBOM artifacts: 365 days (audit compliance - SOC2, ISO27001, FedRAMP)
+CAS_RETENTION_SBOM_ARTIFACTS_DAYS=365
+
+# Scan results: 90 days (common compliance window)
+CAS_RETENTION_SCAN_RESULTS_DAYS=90
+
+# Evidence bundles: indefinite (content-addressed, immutable, audit trail)
+CAS_RETENTION_EVIDENCE_BUNDLES_DAYS=0
+
+# Attestations: indefinite (signed, immutable, verifiable)
+CAS_RETENTION_ATTESTATIONS_DAYS=0
+
+# Temporary artifacts: 1 day (work-in-progress, intermediate files)
+CAS_RETENTION_TEMP_ARTIFACTS_DAYS=1
+
+# =============================================================================
+# TELEMETRY (optional)
+# =============================================================================
+OTLP_ENDPOINT=

deploy/compose/env/mock.env.example

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+# Dev-only overlay env for docker-compose.mock.yaml
+# Use together with dev.env.example:
+#   docker compose --env-file env/dev.env.example --env-file env/mock.env.example -f docker-compose.dev.yaml -f docker-compose.mock.yaml config
+
+# Optional: override ports if you expose mock services
+ORCHESTRATOR_PORT=8450
+POLICY_REGISTRY_PORT=8451
+VEX_LENS_PORT=8452
+FINDINGS_LEDGER_PORT=8453
+VULN_EXPLORER_API_PORT=8454
+PACKS_REGISTRY_PORT=8455
+TASK_RUNNER_PORT=8456