v0.4.0

Changelog

• 515c7c7: chore(ci): bump actions/setup-python from 5 to 6 (#69) (@dependabot[bot])
• 9802bb6: chore(ci): bump docker/build-push-action from 6 to 7 (#71) (@dependabot[bot])
• 420a62d: chore(ci): bump docker/metadata-action from 5 to 6 (#70) (@dependabot[bot])
• 958bb19: chore(ci): bump docker/setup-buildx-action from 3 to 4 (#72) (@dependabot[bot])
• 15808c0: chore(ci): bump github/codeql-action from 3 to 4 (#73) (@dependabot[bot])
• 3bafc01: chore(ci): bump the github-actions group with 3 updates (#77) (@dependabot[bot])
• e3774e3: docs(otel): add a provisioned Grafana + Tempo cost & governance dashboard (#75) (@prashar32)
• e2bf6fe: feat(otel): emit a span for every governed MCP tool call (#68) (@prashar32)
• 101efe9: feat(otel): support OTEL_EXPORTER_OTLP_HEADERS for authenticated export (#76) (@prashar32)
• 5e4bf3f: release: v0.4.0 (#78) (@prashar32)

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