fix: update dev script to watch for changes in index.ts

[gilbertsahumada]

This pull request introduces a minor update to the development workflow for the MCP server package. The change improves the developer experience by enabling automatic rebuilds and restarts when editing source files.

• Development command update: The dev script in package.json now uses tsx watch src/index.ts instead of tsx src/index.ts, enabling watch mode for live reloading during development.

[changeset-bot]

🦋 Changeset detected

Latest commit: ace93a1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sei-js/mcp-server	Patch

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[Copilot]

Pull Request Overview

This PR enhances the development workflow by enabling watch mode for the MCP server's dev script, allowing automatic rebuilds and restarts when source files change during development.

• Added watch functionality to the dev script using tsx watch instead of tsx
• Included a changeset documenting the improvement for patch release

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/mcp-server/package.json	Updated dev script to use tsx watch mode
.changeset/early-spiders-camp.md	Added changeset entry for the dev script improvement

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