refactor: use rollup to build the cli package

[cacieprins]

• Closes

Additional details

When using pure tsc to build the cli package, we are unable to include other packages from the monorepo without quite a bit of hassle. Migrating to rollup for the cli build process enables bundling monorepo packages up with the cli, reducing the need for custom scripting.

This PR also edits the pre/post build scripts for clarity. They're named after what they do, and are included in the proper package.json hook scripts to describe when they're executed.

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Note

Build & Packaging

• Switches CLI build to Rollup with CJS/ESM outputs; adds rollup.config.mjs, bundles tslib, externalizes node_modules, and preserves lib/* structure in dist/
• Updates package.json scripts (prebuild/postbuild, build(-cli)) and dev deps; adds ./bin export mapping; introduces clean-cli-build and postbuild steps to prep build/
• Adds scripts for build prep and bundling CT frameworks; removes legacy scripts; extensive README updates explaining new flow

Runtime & API Refactors

• Refactors lib/cypress.ts and lib/exec/xvfb.ts to named exports; lib/index.ts re-exports named APIs and keeps default export for CJS compatibility
• Changes CLI binary entry (lib/bin/cypress.ts) to bootstrap via ../cli
• Introduces relative-to-repo-root helper; updates exec/spawn.ts and tasks/verify.ts to resolve scripts/start.js from repo root in dev mode

Tests & Config

• Updates unit tests to new module shapes and dev path resolution; adjusts expectations for spawn args
• Adds entries to knip.json; minor .gitignore fix; refreshes yarn.lock

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Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• [NA] Has a PR for user-facing changes been opened in cypress-documentation?
• [NA] Have API changes been updated in the type definitions?

[cypress]

cypress    Run #68617

Run Properties:   Passed #68617  •  5c59239c55: add entrypoints to cli knip config

Project	cypress
Branch Review	refactor-cli-rollup
Run status	Passed #68617
Run duration	19m 37s
Commit	5c59239c55: add entrypoints to cli knip config
Committer	Cacie Prins
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	14
Pending	1104
Skipped	4
Passing	26982
View all changes introduced in this branch ↗︎

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Warning

Partial Report: The results for the Application Quality reports may be incomplete.

UI Coverage  45.18%
Untested elements	194
Tested elements	164

Accessibility  97.94%
Failed rules	4 critical   8 serious   3 moderate   2 minor
Failed elements	102

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