feat: Implement policy attestation features and service account delegation

- Added new policy scopes: `policy:publish` and `policy:promote` with interactive-only enforcement.
- Introduced metadata parameters for policy actions: `policy_reason`, `policy_ticket`, and `policy_digest`.
- Enhanced token validation to require fresh authentication for policy attestation tokens.
- Updated grant handlers to enforce policy scope checks and log audit information.
- Implemented service account delegation configuration, including quotas and validation.
- Seeded service accounts during application initialization based on configuration.
- Updated documentation and tasks to reflect new features and changes.

docs/benchmarks/scanner/windows-macos-demand.md

@@ -0,0 +1,17 @@
+# Windows / macOS Analyzer Demand Capture
+
+## Current competitive posture
+- **Trivy** coverage tables enumerate Linux family distributions only (Alpine, Wolfi, Chainguard, Debian/Ubuntu, RHEL/Alma/Rocky, SUSE, Photon, Amazon, Bottlerocket) with no mention of Windows or macOS package managers (source: /tmp/trivy-docs/docs/docs/coverage/os/index.md).
+- **Grype** matchers target Linux ecosystems via Syft catalogers (APK, DPKG/APT, RPM, Portage, Bitnami) with no coverage for Windows Installer, MSI, Chocolatey, or macOS Homebrew/App bundles (source: /tmp/grype-data/grype/matcher/{apk,dpkg,rpm}/matcher.go).
+- **Snyk CLI** focuses on container, open source, IaC, and code scanning routed through the SaaS service; CLI documentation does not advertise Windows/macOS package coverage beyond container images (source: /tmp/snyk-cli/README.md).
+
+## Signals to gather
+1. **Customer interviews** – ask regulated customers deploying Windows Server or Windows container workloads which artifacts require SBOM + VEX and whether current StellaOps scope (Linux images) blocks adoption.
+2. **Sales & SE feedback loop** – capture any RFP items referencing Windows/macOS scanning and log them in the Scanner guild tracker (SCANNER-ANALYZERS-OS-*).
+3. **Support telemetry** – review ticket tags for “windows”, “macos”, “dotnet framework” to quantify inbound demand.
+4. **Community landscape** – monitor Trivy/Grype/Snyk release notes for Windows/macOS announcements; update this note and the feature matrix when competitors change posture.
+
+## Next actions
+- Coordinate with Product Marketing to add Windows/macOS discovery prompts into upcoming customer advisory sessions (target: Sprint 132 intake).
+- Instrument the scanner roadmap intake form with explicit checkboxes for Windows/macOS package ecosystems.
+- If three or more qualified customers flag Windows/macOS coverage as a blocking requirement, open a design spike under the Scanner Analyzer Guild with scope/time estimates and Offline Kit considerations.