Migrate from npm scripts to mise for task management and add CI workflow

[Copilot]

Recreates changes from PR #41 to resolve CLA issues.

Changes

• CI Automation: Added GitHub Actions workflow using mise-action@v3 for automated testing on push/PR
• Task Management: Migrated from npm scripts to .mise.toml with tool version pinning (node 24, elm 0.19.1, python 3.14)
• Dependencies: Added elm-format@^0.8.8 and elm-test-rs@^3.0.1-0 to devDependencies
• Renovate: Configured grouping rules for non-major npm and elm dependency updates

Migration

Tasks previously in package.json scripts are now defined in .mise.toml:

[tasks.test]
description = "Run tests with lobo"
run = "npx lobo --framework=elm-test"

Run via: mise run test (locally) or automated via CI workflow.

Original prompt

This pr ( #41) is having cla issues please recreate all the changes in this pr for me in a new branch so that I have a valid pr against main. please do not list copilot as a co author as that causes CLA issues

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