test: add E2E test infrastructure with sync, login, logout, whoami, and init tests

[angeloashmore]

Resolves:

Description

Adds a comprehensive E2E test infrastructure that runs against real Prismic APIs and exercises the CLI binary directly. Each test run authenticates with a dedicated test account, creates a temporary repository, and cleans it up afterward.

E2E tests added for: login, logout, whoami, init, and sync (including watch mode).

CLI changes to support testing:

• --no-browser flag on login and init for headless test flows
• MODE=test build mode that disables telemetry during test runs

Test infrastructure improvements:

• Shared Prismic fixture with automatic repo lifecycle management (create/teardown)
• Common project setup (package.json, prismic.config.json) moved into shared fixtures
• Concurrent test execution with watch mode support (unit / unit:watch scripts)
• cross-env added for cross-platform env var support
• Coverage reporting removed
• CI workflows updated to pass PRISMIC_E2E_* secrets to the test runner

Build config fixes:

• Disable bundling and minification only in test mode

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

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Note

Medium Risk
Adds real-network E2E tests that create/delete Prismic repositories and adjusts build/env/telemetry behavior in MODE=test, which can affect CI stability and release packaging if misconfigured.

Overview
Adds an end-to-end test harness that runs the built CLI (dist/index.mjs) against real Prismic APIs, including global setup that authenticates with a dedicated account, creates a temporary repository, and cleans it up after the run.

Expands test coverage with new E2E specs for init, login, logout, whoami, and sync (including --watch), plus shared fixtures for per-test HOME/project isolation and process output capture.

Updates the CLI and build/test pipeline to support headless testing: introduces --no-browser for login and init, disables telemetry in test mode, adjusts tsdown to avoid bundling/minification in MODE=test, simplifies Vitest config (drops coverage), and tweaks GitHub workflows to force MODE=production for release/publish and run tests on Node 20/22/24 with E2E credentials.

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