docs(building-block-inventory): add nuget publication baseline

docs/contracts/nuget-publication-baseline.md

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+# Inventory Contracts NuGet Publication Baseline
+
+## Feed
+
+- Source: `http://192.168.68.156:3000/api/packages/AgileWebs/nuget/index.json`
+- Authentication: Gitea login + token
+- HTTP requirement: `allowInsecureConnections="true"` in `nuget.config`
+
+## Published Baseline
+
+| Package | Version | Published On |
+| --- | --- | --- |
+| BuildingBlock.Inventory.Contracts | 0.1.0-decouple.20260225140619 | 2026-02-25 |
+
+## Dependency Note
+
+`BuildingBlock.Inventory.Contracts` depends on:
+
+- `Core.Blueprint.Common` version `0.1.0-decouple.20260225140619`
+
+When publishing contract packages built with project references, use a coordinated version across dependent packages.
+
+## Consumer Validation
+
+Restore validation passed using:
+
+- `TargetFramework`: `net10.0`
+- `PackageReference`: `BuildingBlock.Inventory.Contracts` `0.1.0-decouple.20260225140619`
+- Restore flags: `--no-cache --force` after package publication