refactor(runtime-host): unify tool ceiling projection

[Astro-Han]

Summary

Unify Interactive Run tool ceilings around concrete MakaTool[] bindings.

Hosted execution profiles now own both tool selection and schema projection. This removes the parallel boundToolNames composer input while preserving the exact child ceiling and the headless-coding-v1 tool contract.

Refs #1099

Verification

• npm --workspace @maka/runtime-host run build
• node --test packages/runtime-host/dist/__tests__/hosted-execution-tool-profile.test.js
• focused execution-model-composition.test.js cases for bound ceilings, Client Capabilities, and the headless coding profile
• npm run format:check

The complete execution-model-composition.test.js file was also run before the change: 23/24 cases passed; the unrelated implementation-child patch case failed its completion assertion. The focused affected cases passed before and after the change.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Maka audited the duplicate ceiling representations, implemented the refactor, updated tests, and ran focused validation.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No