fix assign bot to not always return 96

[mvadari]

High Level Overview of Change

This PR fixes an issue in the XLS assign bot where it wasn't looking at the right folder/repo.

Context of Change

The XLS assign bot is a bit broken - it returned 96 in #477 when it should have returned 97

Type of Change

• Infrastructure (CI, workflows, scripts, website)

[Copilot]

Pull request overview

Fixes the XLS number assignment automation so it calculates the next XLS number from the PR’s repository contents (instead of the sparse-checked-out base-branch script folder), addressing cases where it previously always returned 96.

Changes:

• Pass the PR workspace root into the assignment step via REPO_ROOT.
• Update assign_xls_number.py to prefer REPO_ROOT (with a fallback to deriving the path from the script location).
• Add additional env vars to the workflow step (not all appear to be used).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/assign-xls-number.yml	Exports REPO_ROOT (and other env vars) for the assignment step so the script can scan the correct checkout.
.github/scripts/assign_xls_number.py	Uses REPO_ROOT env var to determine the repository root when computing the next available XLS number.

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