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.

src/Scanner/__Libraries/StellaOps.Scanner.Analyzers.Lang.Ruby/TASKS.md

@@ -2,6 +2,6 @@
 
 | Task ID | State | Notes |
 | --- | --- | --- |
-| `SCANNER-ENG-0016` | DOING (2025-11-10) | Building RubyLockCollector + multi-source vendor ingestion per design §4.1–4.3 (Codex agent). |
+| `SCANNER-ENG-0016` | DONE (2025-11-10) | RubyLockCollector merged with vendor cache ingestion; workspace overrides, bundler groups, git/path fixture, and offline-kit mirror updated. |
 | `SCANNER-ENG-0017` | DONE (2025-11-09) | Build runtime require/autoload graph builder with tree-sitter Ruby per design §4.4, feed EntryTrace hints. |
 | `SCANNER-ENG-0018` | DONE (2025-11-09) | Emit Ruby capability + framework surface signals, align with design §4.5 / Sprint 138. |