Support ordered mixed managed and runner-native tool batches

[mostlydev]

Summary

Support ordered mixed managed and runner-native tool batches by serializing a managed prefix before handing runner-native execution back to the runner.

What Changed

• update ADR-020 and the public tools docs to allow monotonic mixed ownership instead of rejecting all mixed same-response batches
• add a live OpenClaw spike that proves the real model path with same-response managed+native tool calls
• update the submodule pointer to the cllama runtime change that serializes managed-prefix/native-suffix batches and logs the intervention marker

Verification

• go test ./internal/proxy/... (in cllama/)
• go test -tags spike ./cmd/claw -run TestDoesNotExist
• go test -tags spike ./cmd/claw -run TestSpikeOpenClawAdditiveToolsLive -count=1 -v

Dependency

• Serialize managed-prefix mixed tool responses cllama#8

Closes #165