Description

Adds a changelog-sync.yml workflow that, on each published release, opens a cross-repo PR into strands-agents/harness-sdk to update the changelog page (which aggregates releases across the Strands SDKs and lives in harness-sdk).

It's a thin caller of the shared strands-agents/devtools/changelog-release-pr composite action (see the devtools PR) — all parsing/rendering logic lives there, deterministically, with no logic duplicated here. Also supports workflow_dispatch with a backfill input for the one-time historical import.

Related Issues

Part of the Strands changelog feature (harness-sdk site PR + devtools action PR).

Type of Change

New feature

Testing

• Workflow YAML validated (parses cleanly).
• The devtools action it calls is unit-tested (38 tests) and validated end-to-end against the harness-sdk changelog schema, including a real evals release (v0.2.1).

Notes for reviewers

• Auth (secrets.CHANGELOG_PR_TOKEN) is a placeholder pending confirmation. The evals job's own github.token can't open a PR on harness-sdk; this needs a token with pull-requests:write + contents:write on harness-sdk. Please point me at the org's existing cross-repo automation token to reuse rather than provisioning a new secret.