fix(package): align verdict-risk boundary and CI

[mrnicholasbcarter-code]

Summary

• Align the released verdict-risk distribution with the compatible trade_risk_engine import namespace.
• Make CI/lint dependencies explicit and non-fallback.
• Remove stale repository/package claims from contributor and issue-template docs.
• Add isolated wheel and sdist import/console smoke coverage.

Fixes #15

Evidence

• Code Review Graph diff analysis: low risk (0.30), no detected test gaps for the changed package boundary.
• 40 tests passed.
• Ruff check and format check passed.
• MyPy passed.
• Build and Twine checks passed.
• Isolated wheel and sdist installs imported trade_risk_engine and ran verdict-risk-benchmark --help.
• git diff --check passed.

Compatibility

The distribution is verdict-risk; the existing Python import namespace remains trade_risk_engine by deliberate compatibility policy. verdict_risk is not claimed until a separate migration is implemented.

[mrnicholasbcarter-code]

Independent exact-diff review completed: package/import compatibility is documented, CI uses declared extras, and isolated wheel/sdist smoke passed. All required checks are green; self-approval is unavailable for the PR author.