fix(cosh): add installation of extension examples and update package …

[kongche-jbw]

Description

The co extensions new command fails when the CLI is bundled (RPM installation) because the examples directory containing boilerplate templates is not included in the build output.

After bundling, import.meta.url in new.ts resolves to the directory of cli.js (e.g. /usr/lib/copilot-shell/), so join(__dirname, 'examples') points to a non-existent path. This fix ensures examples are copied into dist/examples/ during build and installed alongside the CLI.

Changes:

• esbuild.config.js: Copy packages/cli/src/commands/extensions/examples/ to dist/examples/ after bundling
• Makefile: Install dist/examples/ to $(LIBDIR)/examples/ during make install
• prepare-package.js: Add examples to the npm publish files list

Related Issue

fixes #259

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Scope

• cosh (copilot-shell)

Checklist

• I have read the Contributing Guide
• My code follows the project's code style
• For cosh: Lint passes, type check passes, and tests pass

Testing

1. Run npm run bundle in src/copilot-shell/ and verify dist/examples/ is created with all 5 template directories (agent, commands, context, mcp-server, skills)
2. Run co extensions new test mcp-server and verify the template is successfully created
3. Run make install DESTDIR=/tmp/test-install PREFIX=/usr and verify examples are installed to /tmp/test-install/usr/lib/copilot-shell/examples/

Additional Notes

No changes to new.ts — the existing path resolution join(__dirname, 'examples') works correctly once examples are placed alongside cli.js.

[gemini-code-assist]

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[samchu-zsl]

LGTM, thx!