Giorgi / DuckDB.NET / 38765362080

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Benchmark every hot path against a published package

The benchmark project runs each case twice, against a package from
nuget.org or GitHub Packages and against the code in the repository.
It holds the benchmarks written for the performance work since 1.5.6,
reviewed for duplicates and trimmed to one case per path: the readers
of numbers, strings, dates and times, HUGEINT, UUID, decimals, VARINT
and composite types; the appender for numbers, decimals, strings,
dates, BigInteger, enums, lists and the mapped appender; scalar and
table functions; parameters; a few small commands; and a wide table of
mixed types read by ordinal, by name and with GetValues.

Every class logs which library each job loaded. --aa runs the baseline
against itself, to show the noise of the machine before a comparison.
The project file is Benchmarks.csproj again, with an assembly of the
same name, because BenchmarkDotNet looks for the project by the name
of the assembly. The InternalsVisibleTo for the old assembly name is
removed: no benchmark uses internals anymore.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TXdqHuNtM7YXS8B65qdfxX

2052 of 2285 branches covered (89.8%)

Branch coverage included in aggregate %.

3776 of 4012 relevant lines covered (94.12%)

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