Remove the JavaScript code generator

[leighmcculloch]

What

Remove the JavaScript generator, its test fixtures, and its README and CLI references, making go the CLI's default language.

Why

js-stellar-base and js-stellar-sdk v17 generate their XDR from the rs-stellar-xdr JSON AST instead, so nothing consumes this generator any more.

[Copilot]

Pull request overview

Removes the obsolete JavaScript generator and makes Go the CLI default.

Changes:

• Deletes JavaScript generator implementation and fixtures.
• Removes JavaScript registration and test coverage.
• Updates CLI defaults and documentation.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Updates generator documentation.
lib/xdrgen/cli.rb	Makes Go the default language.
lib/xdrgen/generators.rb	Removes JavaScript registration.
lib/xdrgen/generators/javascript.rb	Deletes JavaScript generator.
spec/lib/xdrgen/generator_spec.rb	Tests only Go generation.
spec/output/generator_spec_javascript/block_comments.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/const.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/enum.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/nesting.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/optional.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/struct.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/test.x/MyXDR_generated.js	Deletes JavaScript fixture.
spec/output/generator_spec_javascript/union.x/MyXDR_generated.js	Deletes JavaScript fixture.

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