fix(assistant): support anthropic native tool names

[omarluq]

Summary

• map Anthropic OAuth tool definitions to Claude Code-style tool names
• map incoming Anthropic native tool calls back to local tool names
• add eager input streaming metadata on Anthropic tool definitions
• reject empty write content at the tool layer

Validation

• mise exec -- go test ./...
• mise exec -- task build
• mise exec -- task ci

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/anthropic-native-tools

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud