build(npm): prepare package for publication

[WH-2099]

Summary

• configure @mosoo/agent-driver as a public scoped npm package
• use package.json as the single runtime version source
• update package documentation, consumer imports, and artifact contract snapshots

Why

The repository package metadata and runtime client versions still used the pre-publication agent-driver identity and duplicated version literals. This prepares one coherent npm package contract without adding release automation in the same change.

Impact

Consumers will install and import @mosoo/agent-driver. The internal process runner remains available through the agent-driver CLI and is no longer exposed as a library subpath.

Validation

• vp fmt on changed files
• vp run lint
• vp run tc
• vp run test: 1073 passed, 20 skipped
• vp run build

Out of scope

• GitHub Actions release workflow
• release runbook

Closes #71

[Copilot]

Pull request overview

Prepares @mosoo/agent-driver for public npm distribution and centralizes runtime version metadata.

Changes:

• Configures scoped public package metadata, exports, files, and prepack build.
• Sources runtime client versions from package.json.
• Updates consumer documentation and artifact contract tests.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Defines the public npm package contract.
bun.lock	Updates the workspace package identity.
README.md	Documents scoped installation and imports.
src/core/version.ts	Exposes the manifest version internally.
src/bin/driver-process.ts	Uses the shared runtime version.
src/runtimes/acp/acp-driver-backend.ts	Uses the shared ACP client version.
src/runtimes/claude/agent-sdk-query-options.ts	Uses the shared Claude client version.
src/runtimes/mcp/remote-http-mcp-executor.ts	Uses the shared MCP client version.
src/runtimes/openai/app-server-client.ts	Uses the shared OpenAI client version.
tests/driver-artifact-contract.test.ts	Expands publication contract coverage.
tests/public-api-consumer.ts	Validates scoped consumer imports.
tests/public-api-exports.snapshot.json	Removes the private runner subpath.

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