[rrbe]

Summary

Existing workflows report Node.js action-runtime deprecation, missing Go cache dependency files, and Ubuntu runner migration warnings. Update the action versions and runner selection, and point Go caching at the server module.

• Upgrade CI setup-node from v4 to v7 and use Node.js 24 for documentation builds.
• Use pnpm/action-setup v6.1.0 consistently in CI and documentation deployment.
• Set cache-dependency-path to server/go.mod in all three setup-go steps.
• Use ubuntu-26.04 for Linux CI and documentation jobs.

Validation

• actionlint passed with a temporary configuration registering ubuntu-26.04, which the installed version does not yet recognize.
• git diff --check passed.
• Hosted CI passed on commit 3efac5b: documentation, Go server, and the complete macOS smoke job including Release tests (run). Documentation deployment and release workflows retain their existing triggers and are not exercised by the PR.

CI reliability

The macOS job exposed an XCTest task-context crash and a timing-dependent share-rotation test. Run the MainActor credential-marker test asynchronously so its objects remain in XCTest’s async task context. Rotate the share at an explicit authenticated request boundary instead of using a 1.5 MB URI to delay routing. The regression still verifies file reads, uploads, old-token rejection, and new-token access across rotation.

• Complete Debug test suite passed: 105 tests.
• Release remote-sharing suite passed 12 consecutive runs after the actor-lifecycle change.
• Release CI test selection passed locally: 31 tests.
• Mutation verification: rereading the current share after authentication fails both read and upload isolation assertions; restoring the snapshot implementation passes.