Require closed research evidence for promotion

[Pigbibi]

Scope

• Require versioned, closed research evidence before promotion.
• Preserve PIT, membership, adjustment, and universe provenance with survivorship controls.
• Keep call sites research-only; no provider, promotion, or live execution is invoked.

Validation

• Fresh origin/main archive: exactly 79 tests.
• This exact 7-file patch adds 15 tests; deterministic expected total: 94.
• Fresh PYTHONPATH=src:../QuantPlatformKit/src python3 -m pytest -q: 94 passed.
• Ruff, compileall, git diff --check, cached diff check, and sensitive diff scan passed.

No provider/promotion/live execution was triggered. This PR is not merged.