Move all 154 PackageReference versions (96 distinct packages) out of the 14
project files into a single central Directory.Packages.props with
ManagePackageVersionsCentrally=true. No version changes — every package was
already pinned identically across projects (no conflicts detected), so this is a
pure relocation: updates become one-line and cross-project version drift is
structurally impossible.
Also copy Directory.Packages.props into the Docker image build before restore:
with CPM the csproj carry no versions, so the image's `dotnet restore` fails
without the central manifest (verified: NU1015 across every project).
Restore + Release build verified locally, plus a simulation of the image's
restore layer under linux-x64 (0 errors; only the pre-existing
NCalcSync/SQLitePCLRaw advisories remain, demoted to warnings, tracked in #8).
Part of #14.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
timothyandClaude Opus 4.8
77a28fcefc