fix(actions): make artifact signature payloads unambiguous #146
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Summary
Replaces concatenation-style HMAC signing with unambiguous binary payload for artifact URLs. Prevents potential signature confusion attacks.
Upstream Reference
Severity: Medium
Security hardening for artifact URL signing.
Action
Cherry-pick from upstream
release/v1.26.Authored-by: Claude Opus 4.6 (1M context) noreply@anthropic.com