v0.16.0-rc2

Changelog

• 0881f7b chore: apply suggestions about .Debug()
• 22e01fe chore: fix formatting and clarify observability docs
• 6571234 chore: lint and format OpenTelemetry code
• 3327487 chore: remove leeway-dev.sh helper script
• 67a035a feat(build): implement dependency-aware download scheduling
• a2b7bfa feat: add OpenTelemetry tracing with build and package spans
• 7076f89 feat: add TLS configuration and fix version retrieval for OTel
• 18421a6 feat: add docker-in-docker to devcontainer
• c7ced70 fix(sbom): use determineDockerExportMode for consistent export mode detection
• 7db83ae fix(tests): use fast latency for performance tests in CI
• 916eb9f fix: enable mock for unit tests that use dummy docker
• 682d659 fix: extract container files from OCI tar instead of Docker daemon
• 9ba4bce fix: properly shutdown OpenTelemetry tracer after build completes
• 9886d85 fix: replace for cycle with faster (O(n log n)) stable slice sorting algorithm from Go stdlib
• 8d9394a fix: resolve variable shadowing and add path structure docs
• e1a2536 fix: respect Docker export mode in SBOM generation
• 9971a07 fix: skip vulnerability scanning for packages that failed to build
• b246f9f perf(cache): optimize S3 cache with batch operations and increased workers
• dda4fb7 refactor(cache): remove pointless processPackages wrapper
• ed21cab refactor: add CleanupFunc type alias and address review feedback
• c2ec571 refactor: improve OTLP endpoint configuration handling
• af13065 refactor: reuse extractTarToDir in extractTar
• 53461e3 style: apply gofmt formatting