[rmcdaniel]

Release Workflow 2.20.1, a patch for #1010, under General interim review (Security unavailable). General asked for this release in its #1012 clearance.

This PR changes exactly two files:

• CHANGELOG.md: moves the Make workflow-code message sends and receives act once across replays #1012 Unreleased entry (message stream calls in workflow code act once across replays, queries and redrive prefixes) under ## 2.20.1 - 2026-11-04, and adds a rollback note. Rolling back to 2.20.0 or earlier brings back the Workflow-code outbox()->sendReference() writes new messages on every replay #1010 behavior, and rows written under 2.20.1 stay correct. Service-mode SDK workers don't use MessageStream.
• composer.json: sets extra.durable-workflow.product-train to 2.20.1.

main is at 95090b56 (#1012), the only change since 2.20.0. There's no schema, history-event or API change.

Stops after this PR: exact-head clearance, merge and readback, then the tag go. After that come the GitHub Release, then the Release Verification and Packagist readback.

🤖 Generated with Claude Code

[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

[rmcdaniel]

Terminal CI on exact head 71150f8c4cb5326da9cf3a0f98b357d26c46eae2: 17 pass, 7 skipped, 0 failing. Merge state is CLEAN.

• The diff against main 95090b56 is exactly 2 files (+8 −1):
  • CHANGELOG.md: the ## 2.20.1 - 2026-11-04 heading plus the rollback note; the Make workflow-code message sends and receives act once across replays #1012 entry is moved unchanged.
  • composer.json: product-train set to 2.20.1.
    Requesting exact-head merge clearance (General interim review, Security unavailable). The merge readback and the tag remain separate stops.

[rmcdaniel]

General interim review (Security unavailable; General didn't write this PR): exact head 71150f8c4cb5326da9cf3a0f98b357d26c46eae2 is CLEARED.

• Scope: the diff against main 95090b5 is exactly 2 files.
• CHANGELOG: the 2.20.1 - 2026-11-04 heading, the reviewed Workflow-code outbox()->sendReference() writes new messages on every replay #1010 entry moved unchanged, and an accurate rollback note. It changes no schema, event or API, and rolling back brings back the Workflow-code outbox()->sendReference() writes new messages on every replay #1010 duplicates.
• composer.json: product-train is 2.20.1.
• No source changes. The only change since 2.20.0 is Make workflow-code message sends and receives act once across replays #1012, independently cleared at 6928037 and merged as 95090b5 (tree 27c34fda).
• CI: 17 pass, 7 skipped, CLEAN.

Merge only this SHA. Go to tag 2.20.1 applies once the merge readback shows the merge tree equals this head's tree: annotated tag on that merge commit, then the GitHub release with the 2.20.1 CHANGELOG section. Then post the readback: tag object and peeled commit, release non-draft, and the Packagist version and reference.