Audit and fix GitHub Actions workflows

[Copilot]

Five workflows existed; three had real problems. Removes matrix noise, eliminates a single-item strategy matrix, and fixes a recurring Scorecards failure that was red on every main push.

Changes

• ci.yml — Drop Node 20/22 matrix. engines.node >= 20 and action.yml both pin node20; a second version adds runner cost with no signal.
• codeql.yml — Remove single-item language matrix. Replaced ${{ matrix.language }} with the literal javascript-typescript directly.
• scorecards.yml — Flip publish_results: true → false. The Scorecards webapp was returning HTTP 400 ("workflow verification failed") on every push to main. Analysis and SARIF upload to code scanning still run.

Kept unchanged

• dependency-review.yml — Clean and correct as-is.
• action-bundle-check.yml — Valid: guards that the committed apps/action/dist/index.js bundle stays in sync with source.

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[Copilot]

Pull request overview

This PR audits and simplifies GitHub Actions workflows by removing redundant matrices and addressing a persistent Scorecards publishing failure while keeping Code Scanning (SARIF) uploads intact.

Changes:

• Simplify CI by removing the Node version matrix and pinning the workflow to Node 20.
• Remove a single-item language matrix from the CodeQL workflow and inline the language value.
• Disable Scorecards “publish_results” to avoid the recurring publish/verification failure while still uploading SARIF to code scanning.

Reviewed changes

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

File	Description
.github/workflows/ci.yml	Removes Node matrix and runs validation on Node 20 only.
.github/workflows/codeql.yml	Deletes single-item matrix and hardcodes javascript-typescript in CodeQL init.
.github/workflows/scorecards.yml	Sets publish_results: false while keeping SARIF upload step.

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