docs(DOC-1919): add cloud stub for Connect Aurora IAM-roles guide

[Feediver1]

Summary

Adds the cloud-docs stub for the new "Authenticate to Amazon Aurora using IAM roles" Connect guide so it publishes under /cloud-data-platform/develop/connect/guides/cloud/aws-iam-aurora/ alongside the existing AWS/GCP credential guides.

The Connect-side guide already carries tag::single-source[] markers but had no cloud-docs stub, so the page was only publishing under the standalone Redpanda Connect docs. Since DOC-1919 targets Cloud customers and postgres_cdc / pg_stream / mysql_cdc are Cloud-supported, this stub completes the Pattern B single-source.

Changes

• modules/develop/pages/connect/guides/cloud/aws-iam-aurora.adoc — new stub matching the shape of sibling aws.adoc and gcp.adoc (single-source include + page alias)
• modules/ROOT/nav.adoc — adds the new entry under "Cloud Credentials", between the existing AWS and GCP entries
• modules/get-started/pages/whats-new-cloud.adoc — June 2026 entry describing the new guide

Companion PR

Connect-side content: redpanda-data/rp-connect-docs#396

This cloud-docs PR is safe to merge in either order relative to the Connect-side one, since the include resolves through the connect: component and the existing guide content is already on main in Connect (the rp-connect-docs PR refines headings and adds anchors but the body remains in place).

Preview pages

• Authenticate to Amazon Aurora using IAM roles — preview URL fills in once Netlify builds
• What's New: Connect to Amazon Aurora with IAM roles

Test plan

• Netlify preview builds without errors
• Page renders at /cloud-data-platform/develop/connect/guides/cloud/aws-iam-aurora/ with full body content (the headings + anchors from rp-connect-docs#396 should all surface)
• Nav entry appears under Develop > Connect > Guides > Cloud Credentials, between AWS and GCP
• What's New entry renders in the June 2026 section

🤖 Generated with Claude Code

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📝 Walkthrough

Walkthrough

This PR adds documentation for a new feature that enables Redpanda Connect pipelines to authenticate to Amazon Aurora using IAM roles. The changes include a feature announcement in the "What's New" section describing an IRSA-based two-hop role-chain setup with short-lived RDS IAM tokens, a new guide page for AWS IAM Aurora authentication that includes shared single-source content, and a navigation entry linking to the guide from the Cloud Credentials section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• redpanda-data/cloud-docs#545: Both PRs modify modules/get-started/pages/whats-new-cloud.adoc to add "What's New" Cloud feature entries for different time periods.
• redpanda-data/cloud-docs#604: Both PRs wire documentation pages to canonical sources via include::...:tag=single-source Asciidoc directives.

Suggested reviewers

• micheleRP

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a cloud stub for the Connect Aurora IAM-roles guide, referenced by issue DOC-1919.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	PR description is well-structured, detailed, and includes all key information with clear sections, preview pages, and test plan.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-1919-aws-iam-aurora-cloud-stub

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[micheleRP]

lgtm!