/claim #290

Summary

• Add AWSComprehendRedactor, AWSComprehendPIIRedactor, and AWSComprehendRestClient exports from the JS SDK AI package.
• Support direct text redaction, prompt/message redaction, endpoint chat() wrapping, and stream/operator helpers for observable-style chains.
• Use an injectable Comprehend-compatible client for tests and a dependency-free SigV4 REST client for live AWS Comprehend calls.
• Add a runnable example under JS/edgechains/examples/aws-comprehend-redaction that works without AWS credentials by using a deterministic mock client.

Requirement Checklist

• JavaScript SDK only: yes
• New chainable redaction classes for endpoint/observable-style usage: yes
• Testcases for the classes: yes
• Full working example under JS/edgechains/examples: yes
• Short demo included in this PR: yes
• CLA signed and CI passing: yes

Validation

• npx vitest run src/ai/src/tests/awsComprehendRedactor.test.ts
• npm run build
• npm start from JS/edgechains/examples/aws-comprehend-redaction

Demo

Short demo GIF:

The example prints the original prompt, the redacted prompt, the endpoint-wrapped response, and the stream output. It can also use live AWS Comprehend when USE_LIVE_AWS_COMPREHEND=true and AWS credentials are present.

Full demo transcript, included so the output remains reviewable even if GitHub clips the embedded media:

EdgeChains #290 demo: AWS Comprehend redaction
Runnable example with deterministic mock client; live AWS supported by env vars.

$ cd JS/edgechains/examples/aws-comprehend-redaction
$ npm start

Original prompt:
My name is Jane Doe. Email me at jane@example.com and call 555-0100 about invoice INV-42.

Redacted prompt:
My name is [REDACTED_NAME]. Email me at [REDACTED_EMAIL] and call [REDACTED_PHONE] about invoice INV-42.

Endpoint response:
Prompt received by endpoint: My name is [REDACTED_NAME]. Email me at [REDACTED_EMAIL] and call [REDACTED_PHONE] about invoice INV-42.

Stream output:
My name is [REDACTED_NAME]. Email me at [REDACTED_EMAIL] and call [REDACTED_PHONE] about invoice INV-42.

✓ npx vitest run src/ai/src/tests/awsComprehendRedactor.test.ts