Add model tool-use diagnostics

[mimeding]

Summary

• Adds conservative tool-use status to model compatibility diagnostics and the model detail diagnostics card.
• Reads declared tool-call parser metadata from jang_config.json and records honest evidence paths for chat-level and root-level tool-calling metadata.
• Separates unproven, unsupported, and failed tool-use states without claiming live proof when no tool-result continuation evidence exists.

Validation

• swiftc -parse Packages/OsaurusCore/Services/ModelCompatibilityDiagnostics.swift Packages/OsaurusCore/Views/Model/ModelDetailView.swift Packages/OsaurusCore/Tests/Service/ModelCompatibilityDiagnosticsTests.swift
• git diff --check
• bash scripts/i18n/check.sh
• swiftlint lint Packages/OsaurusCore/Services/ModelCompatibilityDiagnostics.swift Packages/OsaurusCore/Views/Model/ModelDetailView.swift Packages/OsaurusCore/Tests/Service/ModelCompatibilityDiagnosticsTests.swift
• GitHub CI: test-core, test-cli, swiftlint, shellcheck, and release drafter are green on 00ff762a.

Notes

• Local focused swift test --package-path Packages/OsaurusCore --filter ModelCompatibilityDiagnosticsTests was attempted, but local SwiftPM dependency checkout stalled before tests ran on external MLX/secp256k1 submodules. GitHub CI completed the full required test lane successfully.