fix: attribute hosted agent tool telemetry

[Paulo Lacerda (placerda)]

Summary

• correlate tool spans with explicit runtime evidence from the matching invoke-agent span
• preserve strict project, agent, and trace boundaries without name heuristics
• classify Hosted Agent tool rows correctly while retaining metadata-only queries

Validation

• 2456 passed, 1 skipped
• Ruff passed on changed Python files
• live Application Insights validation shows get_weather and convert_temperature as foundry_hosted