feat(runtime): add Trae CLI ACP runtime

[JasonYang0104]

Summary

• add a public Trae CLI runtime adapter that launches traecli acp serve --yolo over ACP stdio
• register Trae CLI in the built-in agent list
• add focused runtime coverage for registration, yolo launch args, and public-surface leakage checks
• update English and Chinese README agent counts / supported-agent tables

Validation

• pnpm --filter @html-video/runtime build
• pnpm --filter @html-video/runtime test
• pnpm exec biome lint packages/runtime/src/defs/trae-cli.ts packages/runtime/src/registry.ts packages/runtime/test/trae-cli.test.mjs
• pnpm -r build
• pnpm -r typecheck
• pnpm smoke
• git diff --check
• built-runtime smoke: findAgent('trae-cli') returns the adapter and detectOne finds local traecli
• traecli acp serve --help includes -y, --yolo

Notes

• pnpm -r test still fails on current main because packages/core declares node --test test/ but has no packages/core/test/ directory.
• pnpm lint still reports pre-existing Biome debt outside this PR scope; focused lint for the changed runtime files passes.