chore(main): release 5.13.3

[github-actions]

🤖 I have created a release beep boop

5.13.3 (2026-07-31)

Bug Fixes

• add defensive cycle guard to prerequisite evaluation (#377) (0372708)
• allow stream to recover from 429, 400, and 408 responses (#379) (2ad5e6f)

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Note

Low Risk
Release-only version and changelog updates; behavioral risk depends on the already-merged fixes, not on new code in this PR.

Overview
Release 5.13.3 — version metadata only in this PR: gradle.properties, .release-please-manifest.json, and a new CHANGELOG section for 5.13.3.

The release notes record two fixes already merged on main:

• Prerequisite evaluation — adds a defensive cycle guard so circular prerequisite chains cannot hang or recurse indefinitely ([fix: add defensive cycle guard to prerequisite evaluation #377]).
• Streaming — the flag stream can retry/recover after HTTP 400, 408, and 429 instead of treating those as non-recoverable failures ([fix: allow stream to recover from 429, 400, and 408 responses #379]).

No SDK source changes appear in the diff; consumers get the version bump and changelog entry for those fixes.

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