feat(mtm-connect): move Connect UI to secondary extension

[codeh007]

Summary

• Add mtm-connect@0.2.0 as a self-contained browser-only mtmharness secondary extension with mock device and execution-world state.
• Add an independent mtm-connect settings namespace and settings.plugin.item card, enabled by default with runtime enable/disable, open, save, reset, and cleanup behavior.
• Remove the old built-in Connect footer action, Host registry/RPC implementation, and DSH client dependency.
• Add package, purity, release, integrity, and CDN read-back gates.

Verification

• pnpm install --frozen-lockfile
• pnpm check
• pnpm --filter mtmharness run pack:check
• pnpm dlx publint run /tmp/mtm-connect-publint/mtm-connect-0.2.0.tgz --strict
• actionlint .github/workflows/release-mtm-connect.yml .github/workflows/release-mtmharness.yml
• npx react-doctor@latest --verbose --scope changed (100/100)
• git diff --check

Release order

Publish mtm-connect@0.2.0 before mtmharness@0.6.0; the Harness release gate verifies the exact local/CDN SHA-256 pin. npm publishing was not run locally because this environment is not authenticated.

Refs codeh007/gomtm#674

[coderabbitai]

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