chore: remove project management scripts

[kristopherjturner]

Remove project automation scripts that were committed in error; these live outside the repo.

[Copilot]

Pull request overview

Removes project management / automation PowerShell scripts that were accidentally committed and are intended to live outside the repository, keeping the repo focused on toolkit scripts and in-repo automation.

Changes:

• Delete the GitHub Project sync/backfill script (sync-issues-to-project.ps1).
• Delete helper scripts used to batch-commit/push workflow updates and backfill ID fields across repos.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
scripts/sync-issues-to-project.ps1	Removes org/project issue sync + field backfill automation that shouldn’t live in-repo.
scripts/commit-id-field-workflows.ps1	Removes local machine batch commit/push helper script.
scripts/backfill-id-field.ps1	Removes one-off project item ID backfill script.

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