uSync: Include-path export pruning, issue sweep, v17 → v19 forward-ports

Repo: KevinJump/uSync

uSync: export all skips content/media outside the Include/Exclude paths before serializing, and doesn't walk branches that can't match (#1176, closes #563)
uSync: regression tests for CreateOnly content in reports (#1175), tab alias clashes and line endings (#1179)
uSync: merged dependabot bumps on v17 (SourceLink 10.0.403, actions/checkout v7, vite 8.3.5)
uSync: forward-ported v17 → v18 → v19 (#1173, #1174, #1177, #1178)
uSync: closed #640 (pointed at ISyncService.ExportSingleItem), #909 (fixed in uSync.Complete 17.3.4), #882 and #495 (both fixed on v17)