fix(kernel): 🐛 Harden env and dependency injection runtime

[haskou]

Summary

• Treat blank optional environment variables as absent, and use defaults for blank optional values with defaultValue.
• Keep required blank environment variables failing with a specific validation error.
• Improve environment validation errors for missing, blank and invalid parsed values.
• Filter known non-actionable autowire warnings from type-only/default declaration files without hiding actionable warnings.
• Cover overrides for external references generated from @haskou/ddd-kernel subpath imports.
• Add runtime compatibility fixtures for ts-node and dist CommonJS using public subpaths, environmentSchema and dependencyInjection overrides.

Validation

• yarn install --frozen-lockfile
• yarn typecheck
• yarn lint
• yarn build
• yarn test:coverage
• yarn docs:build
• yarn format:check
• yarn --cwd example typecheck

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[chatgpt-codex-connector]

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