feat: Add Promotion-Time Attestations for Stella Ops

- Introduced a new document for promotion-time attestations, detailing the purpose, predicate schema, producer workflow, verification flow, APIs, and security considerations.
- Implemented the `stella.ops/promotion@v1` predicate schema to capture promotion evidence including image digest, SBOM/VEX artifacts, and Rekor proof.
- Defined producer responsibilities and workflows for CLI orchestration, signer responsibilities, and Export Center integration.
- Added verification steps for auditors to validate promotion attestations offline.

feat: Create Symbol Manifest v1 Specification

- Developed a specification for Symbol Manifest v1 to provide a deterministic format for publishing debug symbols and source maps.
- Defined the manifest structure, including schema, entries, source maps, toolchain, and provenance.
- Outlined upload and verification processes, resolve APIs, runtime proxy, caching, and offline bundle generation.
- Included security considerations and related tasks for implementation.

chore: Add Ruby Analyzer with Git Sources

- Created a Gemfile and Gemfile.lock for Ruby analyzer with dependencies on git-gem, httparty, and path-gem.
- Implemented main application logic to utilize the defined gems and output their versions.
- Added expected JSON output for the Ruby analyzer to validate the integration of the new gems and their functionalities.
- Developed internal observation classes for Ruby packages, runtime edges, and capabilities, including serialization logic for observations.

test: Add tests for Ruby Analyzer

- Created test fixtures for Ruby analyzer, including Gemfile, Gemfile.lock, main application, and expected JSON output.
- Ensured that the tests validate the correct integration and functionality of the Ruby analyzer with the specified gems.

docs/implplan/SPRINT_513_provenance.md

@@ -9,5 +9,6 @@ Task ID | State | Task description | Owners (Source)
 --- | --- | --- | ---
 PROV-OBS-53-001 | TODO | Implement DSSE/SLSA `BuildDefinition` + `BuildMetadata` models with canonical JSON serializer, Merkle digest helpers, and deterministic hashing tests. Publish sample statements for orchestrator/job/export subjects. | Provenance Guild (src/Provenance/StellaOps.Provenance.Attestation)
 PROV-OBS-53-002 | TODO | Build signer abstraction (cosign/KMS/offline) with key rotation hooks, audit logging, and policy enforcement (required claims). Provide unit tests using fake signer + real cosign fixture. Dependencies: PROV-OBS-53-001. | Provenance Guild, Security Guild (src/Provenance/StellaOps.Provenance.Attestation)
+PROV-OBS-53-003 | TODO | Deliver `PromotionAttestationBuilder` that materialises the `stella.ops/promotion@v1` predicate (image digest, SBOM/VEX materials, promotion metadata, Rekor proof) and feeds canonicalised payload bytes to Signer via StellaOps.Cryptography. | Provenance Guild (src/Provenance/StellaOps.Provenance.Attestation)
 PROV-OBS-54-001 | TODO | Deliver verification library that validates DSSE signatures, Merkle roots, and timeline chain-of-custody, exposing reusable CLI/service APIs. Include negative-case fixtures and offline timestamp verification. Dependencies: PROV-OBS-53-002. | Provenance Guild, Evidence Locker Guild (src/Provenance/StellaOps.Provenance.Attestation)
-PROV-OBS-54-002 | TODO | Generate .NET global tool for local verification + embed command helpers for CLI `stella forensic verify`. Provide deterministic packaging and offline kit instructions. Dependencies: PROV-OBS-54-001. | Provenance Guild, DevEx/CLI Guild (src/Provenance/StellaOps.Provenance.Attestation)
+PROV-OBS-54-002 | TODO | Generate .NET global tool for local verification + embed command helpers for CLI `stella forensic verify`. Provide deterministic packaging and offline kit instructions. Dependencies: PROV-OBS-54-001. | Provenance Guild, DevEx/CLI Guild (src/Provenance/StellaOps.Provenance.Attestation)