fix(evals): moderation record ids drop the leading dot of .github #3132

Component

Eval moderation (scripts/evals/Modules/ModerationRunner.psm1, ConvertTo-ModerationRecords)

Bug Description

Moderation record ids lose the leading dot of .github, so a flagged agent, prompt or skill is reported against a path that does not exist.

The id is built with (Resolve-Path -LiteralPath $filePath -Relative -RelativeBasePath $RepoRoot).TrimStart('.', '\', '/'). TrimStart removes every leading ., \ and /, not only the ./ prefix, so ./.github/agents/x.agent.md becomes github/agents/x.agent.md. That id is written to the moderation output (logs/moderation-artifacts.json through Invoke-ArtifactModeration.ps1), and Test-ModerationOutput uses it in ::error file=<id>::, so the annotation points at nothing. Paths outside a dot-directory, such as docs/y.md, are unaffected. The exit code is still correct.

Expected Behavior

The id keeps the real relative path, .github/agents/x.agent.md.

Steps to Reproduce

With $RepoRoot set to a folder containing .github/agents/x.agent.md and docs/y.md, the expression from line 93 returns github\agents\x.agent.md for the first and docs\y.md for the second (pwsh 7.6.6 on Windows; on Linux the separators are /).