Add automated pycmdcheck submission triage

[eliotwrobson]

Summary

• add an issue-triggered pycmdcheck triage workflow for submissions labeled 0/pre-review-checks
• parse the submission issue body for Repository Link and Version submitted, clone the submitted repository, and run a restricted static pycmdcheck allowlist
• upsert a bot comment with triage findings and clarify the submission template placeholders so the workflow can parse them reliably

What This Covers

• structure checks
• metadata checks
• documentation presence checks
• release metadata checks
• test directory and test naming checks
• CI configuration presence check

What This Does Not Yet Cover

• test execution
• build or install checks
• import checks
• dependency audits
• network-heavy link validation

Validation

• validated the new workflow file in the editor with no YAML errors
• verified the workflow aligns with the existing submission issue template fields
• confirmed the pinned pycmdcheck commit installs and exposes the CLI modes needed for machine-readable output