CellProtocol upstream changed: 1a08fed7c83e -> ac27b86b8dc3

[github-actions]

The Swift CellProtocol upstream has moved beyond the GoCellProtocol recorded baseline.

Upstream repo: Digipomps/CellProtocol
Upstream branch: main
Recorded baseline: 1a08fed7c83e4a01026717edd7b4deaf201a0562
Recorded baseline URL: Digipomps/CellProtocol@1a08fed
Latest upstream SHA: ac27b86b8dc3b69aace9f1ea2aa9a019d8b414ec
Latest upstream URL: Digipomps/CellProtocol@ac27b86
Latest upstream date: 2026-06-17T09:10:54Z
Latest upstream subject: Document purpose interest matching experiments

Suggested update checklist:

• Review the Swift diff from the recorded baseline to the latest upstream commit.
• Port any protocol, bridge, identity, skeleton, resolver, or contract changes that affect GoCellProtocol.
• Run go test ./..., go vet ./..., and the staging CloudBridge smoke when bridge behavior is touched.
• Update .github/upstream/cellprotocol.json to the new upstream SHA in the GoCellProtocol commit that completes the port.