refactor: clarify universal evidence producer and pipeline lifecycle

[forhappy]

Summary

• Replace the ambiguous UniversalCandidate/UniversalComplete lifecycle with Qualifying/Qualified.
• Introduce UniversalEvidenceProducer for language-specific metadata and UniversalEvidencePipeline for the shared route plus qualification state.
• Remove legacy universal adapter/profile APIs from active Rust code and migrate extraction, cache invalidation, resolver, framework-pack, fixtures, and documentation consumers.
• Align qualification manifests, candidate exports, Ruby audit output, and TypeScript scorecards with producer terminology and version their changed schemas to /2.
• Preserve the hard-cut Ruby universal evidence path, framework integration, and qualification coverage included on this branch.

Why

The previous names conflated the evidence implementation with its qualification status and made the lifecycle difficult to read. The new producer/pipeline split makes ownership explicit: producers describe language evidence, while pipelines describe the production route and its audit state.

This is an intentional contract reset. Existing universal evidence, qualification artifacts, caches, and scorecards must be regenerated; backward translation is not provided.

Validation

• 206 Python performance/audit tests and 9 Ruby qualification tests.
• Targeted Rust language/conformance, resolver, and incremental-cache tests.
• cargo check and targeted Clippy with -D warnings.
• cargo fmt --all -- --check and git diff --check.
• Product-boundary validation.
• Full fixture code-graph qualification gate.

Pre-existing untracked .codegraph/, 3rd/, and apps/web/.vercel/ artifacts were not staged.