[rmcdaniel]

Closes #873. Part of #325. Follows #869 and #874.

What changes

After #869, a retried child call has a link per attempt, and the call names the latest attempt's run. Native's cooperative cancellation expected one link per call. So once a child had been retried, a parent's cancellation request was refused (422 cooperative_cancellation_propagation_not_available). Security found this in #869's review.

Published 2.11.7 admits the request, delivers it at the child boundary, and completes the parent as cancelled:

• under abandon, the retry keeps running;
• under try_cancel, the parent records ChildCancellationRequested naming the retry run, and that run records CooperativeCancellationRequested.

PHP's retry ChildRunStarted carries no cancellation_policy.

Native changes:

• child_link_policies accepts a retried call's links: the first under the call's id, each retry under its own, and earlier attempts.
• The delivery boundary reads every link of the call and picks the one for the call's current run. It accepts the call's scheduled event and one started event per attempt; a retry's may omit the cancellation policy.

Fixture retried-child-cancellation

Raw worker HTTP on protocol 1.20, with a cooperative parent worker and a separate child worker. There is one case per policy (abandon, try_cancel). It records:

• the answers;
• the parent's child and cancellation events;
• the child's runs and the retry run's events.

Local checks

• retried-child-cancellation. It passes on a fresh published 2.11.7 harness and on native built from this branch, and compare accepts the pair.
• Neighbors. On that native image, these pass: child-retries, parent-close-cancellation, cooperative-before-claim-cleanup, cooperative-pending-timer-cleanup and direct-child-cancel-pending-timer.
• Rust suites. Library 363 and integration 641, all passing, including every cooperative test. The new test is a_parents_cooperative_cancellation_reaches_a_retried_child.
• Contract unit test. It passes 6/6.

This PR also corrects two stale lines in the port doc: activity delivery is already served, and the 2.11.5 reference move is done.

Checkpoint.

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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