chore: add a2a server bin

[adamfweidman]

TLDR

expose @google/gemini-cli-a2a-server as an executable npm package by wiring its bin entry to the compiled server entrypoint

Dive Deeper

• add a shebang to the server script so the generated JS runs out of the box when invoked via npm
• keep main pointing at the workspace build (dist/index.js) so TypeScript consumers still import the package normally
• the package no longer needs private: true
• change path.resolve to basename as this caused errors when run across symlinks
• npm run build --workspace @google/gemini-cli-a2a-server produces an invokable dist/a2a-server.mjs. This is what npm users will run

I confirmed this worked with GCA in cl/815948932. Reproduce by:

• in a2a-server/package.json change core package to "@google/gemini-cli-core": "0.9.0-nightly.20251002.0f465e88".
• npm pack --workspace=@google/gemini-cli-a2a-server
• Within the GCA repo run `yarn add <outputted_tgz>
• yarn install
• Run the debugger to start GCA

Reviewer Test Plan

• npm run build --workspace @google/gemini-cli-a2a-server to rebuild the workspace output including the server entry
• node packages/a2a-server/dist/a2a-server.mjs to confirm the server boots directly from the compiled artifact
• optionally npx @google/gemini-cli-a2a-server after a local npm pack && npm install to verify the bin shim runs the server end-to-end

Testing Matrix

This PR makes progress on #9207

[gemini-code-assist]

Summary of Changes

Hello @adamfweidman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request transforms the @google/gemini-cli-a2a-server package into a standalone executable, making it publishable and directly usable as a command-line tool. This is achieved by configuring the package.json to expose a binary entry point and adding a shebang to the server's main script, while maintaining its existing module import functionality.

Highlights

• Executable Server: The @google/gemini-cli-a2a-server package is now configured to be directly executable via npm, allowing it to be run as a command-line tool.
• Package Configuration: The package.json has been updated to include a bin entry, mapping gemini-cli-a2a-server to the compiled server entrypoint, and the private flag has been removed to enable publishing.
• Server Script Shebang: A shebang (#/usr/bin/env node) has been added to the server.ts file, ensuring the compiled JavaScript can be executed directly by Node.js.
• Main Entry Point: The main entry in package.json now points to dist/index.js, preserving normal import behavior for TypeScript consumers.

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[gemini-code-assist]

Code Review

This pull request successfully makes the @google/gemini-cli-a2a-server package executable by adding a bin entry to package.json and a shebang to the server entrypoint. While the changes are generally correct, I've identified a potential high-severity issue where a process-wide exception handler is registered unconditionally. This could lead to unintended side effects if the server module is imported by other applications. My review comment details this issue and suggests a fix to improve the package's robustness.

[github-actions]

Size Change: -2 B (0%)

Total Size: 17.8 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	17.7 MB	-2 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	830 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[jacob314]