feat(ruby): add Ruby language bindings for AWS CDK

[omarqureshi]

Issue #38247

Warning

Draft — CI is expected to be red, by design. Ruby code generation requires a jsii release with Ruby target support, which is not yet published (tracked in aws/jsii#5178). Until it ships, jsii-pacmak has no Ruby target on the released toolchain, so packaging/codegen checks will fail. End-to-end generation + Ruby gem publishing have already been validated against a pre-release build of the compiler. Once the compiler is released this will go green.

Reason for this change

Add Ruby as a first-class supported language for AWS CDK, alongside TypeScript, Python, Java, C#/.NET and Go. Ruby-centric infrastructure teams currently maintain a parallel toolchain in another language or avoid CDK entirely. Demand has been long-standing — the original request has been open since 2018 and is one of the most-reacted language asks.

Design is captured in RFC 0935: Ruby language bindings — tracking issue aws/aws-cdk-rfcs#935 (full RFC text).

Description of changes

Strictly additive — no changes to existing languages, no breaking changes.

• Per-module .jsiirc.json Ruby target configuration across aws-cdk-lib (329 modules): each gains a ruby target with its module name (root namespace AWSCDK, idiomatic casing, AWS-prefix de-duplication — e.g. aws-s3 → AWSCDK::S3::Bucket). Naming follows RFC 0935; version suffixes use lowercase v (AWSCDK::WAFv2, matching the IPv4/IPv6 convention).
• tools/@aws-cdk/spec2cdk (submodule-files.ts): when regenerating a module's .jsiirc.json, preserve an existing hand-authored ruby target (java/dotnet/python remain auto-derived). Without this, gen-cdk would wipe the Ruby blocks.

The enabling jsii work (compiler + jsii-pacmak Ruby target + @jsii/ruby-runtime) is in aws/jsii#5178.

Describe any new or updated permissions being added

None — this is code-generation configuration only; no runtime/IAM changes.

Description of how you validated changes

• End-to-end Ruby generation and gem publishing validated against a pre-release build of the Ruby-capable jsii compiler (jsii-calc closure + aws-cdk-lib).
• Generated Ruby signatures validate under rbs validate in the jsii runtime test suite (see feat(ruby): Ruby language bindings jsii#5178).
• This PR's own CI is gated on the public compiler release (see warning above); fixtures will regenerate and CI will pass once it ships.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to an integration test file and the resulting snapshot.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

✅ A exemption request has been requested. Please wait for a maintainer's review.

[omarqureshi]

Exemption Request - This PR contains no runtime code changes, it is pure configuration and as such no integration tests or changes to snapshots have been made.