Sync upstream whatsmeow through fb386f1

[purpshell]

Supersedes #40. The original PR uses tulir/whatsmeow:main as its head and cannot accept Polymorfa conflict-resolution commits.

What changed

• merged the five upstream commits through fb386f1
• retained github.com/polymorfa/hypermeow as the module path
• retained HyperMeow retractions and the Polymorfa libsignal fork
• accepted upstream protobuf, blocklist/LID, group, toolchain, and compatible dependency updates
• refreshed the nested Barback benchmark module graph

Verification

• pre-commit run --all-files
• generated MEX check
• go test ./...
• go test -race ./...
• Barback default tests
• Barback benchmark_legacy tests
• Barback race tests
• git diff --check

No release tag or GitHub release is created by this PR.

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[purpshell]

@codex review exact head e091e71

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: e091e712be

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