[shayanhabibi]

This adds a separately packaged EasyBuild.ShipIt extension so consumers can calculate package versions from conventional commits and update changelogs and project versions in one workflow.

• Add src/extensions/Partas.Build.EasyBuild.ShipIt, version 0.1.0, with typed operations, reusable inputs, stages and a ready-made command tree.
• Provide a ShipIt-backed baked bump that always uses local mode. ShipIt owns version calculation; configured XML updaters synchronize .fsproj Version without modifying AssemblyVersion or applying a second Baked.SemVer increment.
• Add explicit repository-local tool setup and project updater configuration. Preserve existing registrations/changelog content and reject ambiguous manifests or project versions before file changes.
• Register the extension in build/pack/bump workflows. Add an Extensions navbar/menu section, a complete ShipIt guide, agent documentation link and generated extension API reference.

Validation:

• Full Build CLI test command: 558 suite tests and 22 Debug/Release compiler probes passed; 10 skipped, including the opt-in external-tool contract test.
• Focused tool-enabled tests: 19 passed, including real ShipIt 3.1.0 local generation updating a project and changelog from 1.2.3 to 1.3.0 while retaining AssemblyVersion and leaving Git history unchanged.
• Library builds passed for net10.0, net8.0 and netstandard2.0. Local package 0.1.0 verified with README and dependency groups.
• Independent review findings fixed with regression tests for multiline YAML insertion, tool manifest boundaries and validation before changelog initialization.
• Build CLI docs command passed: 121 pages generated. Checked rendered navbar/sidebar links and extension API pages. All guide F# examples compiled with dotnet fsi. git diff --check passed.

The existing docs restore warning NU1608 remains: FSharp.Compiler.Service 43.12.400 requests FSharp.Core 10.1.400 while the repository resolves 10.1.401. Setup is explicit; the extension defaults new ShipIt tool registrations to 3.1.0, which requires .NET 10. Existing flow/empty updater YAML must be normalized to block form before project configuration.