chore: remove the OpenSSF Scorecard workflow

[Fieldnote-Echo]

Reverts #18. Scorecard isn't used for this repository. The workflow file was its only reference.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-30T22:21:34.037893Z	23bac86	PR opened

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[qodo-code-review]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

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[qodo-code-review]

PR Summary by Qodo

Remove unused OpenSSF Scorecard workflow

⚙️ Configuration changes 🕐 Less than 5 minutes

AI Description

• Remove the unused OpenSSF Scorecard workflow, reverting its addition in #18.
• Stop Scorecard runs on main pushes, weekly schedules, and manual dispatches; Lean CI and Docs
 remain unchanged.

High-Level Assessment

Deleting the workflow is the direct approach because it was the repository's only Scorecard reference. Disabling its triggers would retain unused configuration without a benefit.