Cut dead build tooling (ponytail cleanup)

[exactmike]

Summary

Executes the remaining items from plans/ponytail-cleanup.md (item 7, the spec/ folder, was already merged separately in #8):

• Delete Move-Statement (~115 lines) from BuildTasks/BuildModule.Task.ps1 — hand-tokenizes files to reorder #Requires/using statements, but nothing under PSGraph/ uses either
• Delete the class importer + Resolve-DependencyOrder call in BuildModule.Task.ps1, and its duplicate in PSGraph/PSGraph.psm1 — both scan a Classes/ folder that doesn't exist anywhere in the repo
• Drop the Classes entry from $Script:Folders (BuildTasks/InvokeBuildInit.ps1) now that nothing special-cases it
• Drop the DependsOn module dependency from build.ps1 and both CI jobs — its only call sites were the two dead class-importers above
• Delete deploy.PSDeploy.ps1 — PSDeploy DSL never installed by the build pipeline; the publish task calls Publish-Module directly
• Delete requirements.psd1 — a DependsOn-format installer for GraphViz 2.38 (2018), unreferenced and superseded by Install-GraphViz.ps1 and CI's own choco/apt/brew steps
• Delete PSGraph/Data/Aliases.json — unreferenced by any source file
• Remove the Pester build task's code-coverage gate — wired up but inert ($Script:CodeCoveragePercent was pinned to 0.0, so the failure branch could never trigger). Went with delete rather than setting a real threshold, since picking a coverage % is a policy call — happy to add a real gate back in a follow-up if wanted.

Net: -280 lines, -1 module dependency (DependsOn), no behavior change.

Test plan

• Invoke-Build -Task Build succeeds and produces a correct Output/PSGraph/PSGraph.psm1
• Full Pester suite: 401/401 passing against the rebuilt module

🤖 Generated with Claude Code

https://claude.ai/code/session_014u9G91TefcQ42MAGvWrrqK