Document JTI claim generation

[sdelamo]

Summary

• Document the current JtiGenerator extension point for JWT ID (jti) claim generation.
• Add a compiled Java docs snippet showing a custom JtiGenerator bean.
• Correct the touched ClaimsGenerator API link to the current package.

Verification

• git diff --check -- src/main/docs/guide/authenticationStrategies/jwt/claimsGeneration.adoc test-suite/src/test/java/io/micronaut/docs/claimsjti/CustomJtiGenerator.java
• ./gradlew :test-suite:compileTestJava publishGuide --no-daemon --no-parallel --rerun-tasks
• Rendered HTML spot-check confirmed JtiGenerator, generateJtiClaim(), CustomJtiGenerator, jti, and the JwtIdGenerator migration note.

Release Metadata

• Target branch: 5.1.x
• Release target: 5.1.0
• Micronaut organization project selected upstream: 5.1.0 Release (Throw an error if multiple annotations are used. #147), no ambiguity noted upstream.
• Live project association status: not linked by this run; GitHub rejected addProjectV2ItemById because the active GITHUB_TOKEN lacks the required project scope.
• Type label: type: docs

Reviewer Routing

• Linked issue creator: sdelamo.
• Reviewer request status: GitHub rejected requesting sdelamo with Review cannot be requested from pull request author.

PR Assets

None required; this is a text-only guide/snippet change and the rendered guide output was verified locally.

Closes #402

---

✨ This message was AI-generated using gpt-5

[Copilot]

Pull request overview

Documents the existing JWT ID (jti) claim generation extension point (JtiGenerator) in the JWT claims generation guide, including a compiled snippet that shows how to provide a custom generator bean.

Changes:

• Update the ClaimsGenerator API reference to the current io.micronaut.security.token.claims package.
• Add documentation explaining that JWTClaimsSetGenerator will populate the jti claim when a JtiGenerator bean is present, and include a code snippet.
• Add a compiled Java snippet (CustomJtiGenerator) demonstrating a JtiGenerator implementation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test-suite/src/test/java/io/micronaut/docs/claimsjti/CustomJtiGenerator.java	Adds a compiled docs snippet demonstrating a custom JtiGenerator bean.
src/main/docs/guide/authenticationStrategies/jwt/claimsGeneration.adoc	Updates ClaimsGenerator link and documents JtiGenerator-based jti claim generation with snippet + migration note.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud