Publish sdk src files to npm, fix sdk resolution in development

[remorses]

Fix #1579
Fix sst/opencode-sdk-js#25

@opencode-ai/sdk package only has dist folder in package.json files, so bun install only copies dist folder and not src. So development imports fail. bun i only copies files in dist into node_modules

[Copilot]

Pull Request Overview

This PR fixes a development setup issue for clean clone installations by ensuring TypeScript source files are included in the package distribution. The change addresses the problem where the "development" export conditions in package.json point to TypeScript source files that weren't being published.

• Added src directory to the files array in both SDK and plugin package.json files
• Ensures TypeScript source files are available for development mode module resolution

Reviewed Changes

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

File	Description
packages/sdk/js/package.json	Includes src directory in published files to support development exports
packages/plugin/package.json	Includes src directory in published files to support development exports

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[rekram1-node]

can you not do bun run dev or bun run --conditions=development ....?

[remorses]

it makes no difference, it seems like your version of bun copies the src folder while mine does not.

[remorses]

it's good practice anyway to keep src files on npm to make things like sourcemaps and declaration maps work