chore: node24

[louisbennett]

Clean-up from #50, simplifying internal GHA and codifying support of node24+

[Copilot]

Pull request overview

This PR finalizes the Node 24+ baseline work from #50 by updating TypeScript configuration and GitHub Action runtime settings, and by simplifying the CI workflow configuration.

Changes:

• Switch TypeScript base config from @tsconfig/node20 to @tsconfig/node24.
• Update the action runtime to runs.using: node24.
• Simplify CI by removing the Node matrix and adjusting the setup-node step.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Updates TS base config to the Node 24 preset.
package.json	Replaces @tsconfig/node20 with @tsconfig/node24 dev dependency.
package-lock.json	Locks @tsconfig/node24 and removes the node20 preset entry.
action.yaml	Sets the GitHub Action runtime to node24.
.github/workflows/ci.yml	Removes the matrix but now relies on an unpinned Node setup step.

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[Copilot]

Pull request overview

This PR finalizes the Node.js 24+ migration/cleanup after #50 by updating the TypeScript config baseline and the action runtime, and simplifying CI configuration.

Changes:

• Switch TypeScript configuration from @tsconfig/node20 to @tsconfig/node24.
• Update the GitHub Action runtime from node20 to node24.
• Simplify CI workflow and update development documentation to reflect Node 24.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tsconfig.json	Move TS compiler defaults to Node 24 baseline.
package.json	Replace Node 20 tsconfig dependency with Node 24.
package-lock.json	Lockfile update reflecting @tsconfig/node24.
action.yaml	Run the action using the Node 24 runtime.
README.md	Document Node 24 requirement for development.
.github/workflows/ci.yml	Simplify CI Node setup step.

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