fix: Windows genlayer up, localhost access, cross-platform CI

[MuncleUscles]

Summary

• Fix Windows genlayer up (#1548): Remove detached start cmd.exe wrapper that caused ECONNREFUSED. The old command launched a separate cmd window and returned immediately, so the CLI tried to ping :4000 before docker compose even started. Now runs directly with -d flag, with quoted paths for spaces.
• Enable localhost access by default: Generates docker-compose.override.yml and config-overrides/genvm-module-web.yaml on every genlayer up/init, allowing GenVM contracts to reach host services (Anvil, local APIs) via host.docker.internal. Prints a warning.
• Add docker-compose.yml to npm package files: Was missing — the compose file wasn't included in the published package.
• Cross-platform CI: Matrix strategy (ubuntu, macos, windows) for the CI workflow.
• Platform command tests: Unit tests for command generation across all 3 platforms and setupLocalhostAccess.

Test plan

• All 491 existing + new tests pass locally
• CI passes on ubuntu, macos, windows matrix
• Manual test on Windows: npm install -g genlayer && genlayer up should start containers

Closes #1548

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7bd7a005-5730-4dc6-a424-3fb7d5c3bb80

📥 Commits

Reviewing files that changed from the base of the PR and between f022b3b and 3eb6994.

📒 Files selected for processing (13)

• .github/workflows/cli-docs.yml
• .github/workflows/validate-code.yml
• package.json
• src/commands/general/init.ts
• src/commands/general/start.ts
• src/lib/config/simulator.ts
• src/lib/interfaces/ISimulatorService.ts
• src/lib/services/simulator.ts
• tests/actions/init.test.ts
• tests/actions/start.test.ts
• tests/libs/configFileManager.test.ts
• tests/libs/platformCommands.test.ts
• tests/services/simulator.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/windows-and-localhost-access

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