break(kernel): 💥 Improve kernel contracts and environment schema

[haskou]

Summary

• Add typed environment schema choices with runtime validation and literal TypeScript inference.
• Add environment schema metadata fields for documentation and operational tooling.
• Move kernel consumer and route registration types to core contracts with KernelConsumer and KernelRoute.
• Make adapter Consumer and Route implement/extend those kernel contracts.
• Document adapter-specific install/import paths and the registration contracts.
• Keep coverage focused on runtime kernel files instead of excluding all src/kernel.

Breaking changes

• Kernel consumer registration is now typed against KernelConsumer instead of the pub/sub adapter Consumer base class.
• Kernel route registration is now typed against KernelRoute instead of the UI adapter Route base class.
• Custom registered consumers must expose queueName and init(). Adapter consumers already comply.
• Custom registered routes should extend or be assignable to KernelRoute. Adapter routes already comply.

Validation

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

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✅ All modified and coverable lines are covered by tests.

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[chatgpt-codex-connector]

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[haskou]

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