Replace tsup with esbuild and precompile deterministic Playwright suite

[MagellaX]

Swapped out tsup for esbuild so the Stagehand build stays fast and maintained, and taught Playwright to run against precompiled JS instead of scrambling at runtime. We now bundle the library and CLI with tiny esbuild scripts, compile the deterministic suite ahead of time, rewrite its imports, and keep the helper that Playwright was missing. The net effect: pnpm run build and the local e2e suite run clean again, no more __name explosions, and the build pipeline feels a lot healthier.
covers #263

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[greptile-apps]

Greptile Overview

Summary

This PR successfully migrates from tsup to esbuild for build tooling, addressing issue #263. The migration introduces dedicated build scripts for library, CLI, and end-to-end test compilation, replacing the previous tsup-based approach.

Key changes:

• Removed tsup dependency and replaced with esbuild (already present)
• Created modular build scripts: build-lib.mjs, build-cli.mjs, build-e2e.mjs, run-playwright.mjs
• Updated package.json scripts to use new build scripts instead of tsup commands
• Modified TypeScript config to only emit declaration files since esbuild handles JS compilation
• Added sophisticated e2e test precompilation with import rewriting and import.meta compatibility

The new build system addresses the "no more __name explosions" mentioned in the PR description by adding explicit __name helpers in the esbuild banner. The e2e build script precompiles Playwright tests and rewrites Stagehand imports to use the local build, eliminating runtime compilation issues.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk
• Score reflects well-structured migration with proper error handling and compatibility measures, but one minor hardcoded string replacement that could be more robust
• Pay close attention to build-e2e.mjs for the string replacement logic

Important Files Changed

File Analysis

Filename	Score	Overview
package.json	4/5	Replaced tsup dependency with esbuild, updated build scripts to use new build scripts instead of tsup commands
scripts/build-lib.mjs	5/5	Clean esbuild script for library build with proper external dependency handling and __name helper for node compatibility
scripts/build-cli.mjs	4/5	Comprehensive CLI build script with proper executable permissions, config copying, and npm linking with error handling
scripts/build-e2e.mjs	4/5	Complex e2e build script that precompiles Playwright tests, rewrites imports, and handles import.meta compatibility
scripts/run-playwright.mjs	5/5	Simple pass-through script that runs precompiled Playwright tests, avoiding tsx/ts-node timing issues
tsconfig.build.json	5/5	Updated TypeScript config to only emit declaration files, since esbuild now handles JS compilation
pnpm-lock.yaml	5/5	Removed tsup and its dependencies from lockfile, esbuild already present as dependency

Sequence Diagram

sequenceDiagram
    participant Developer
    participant npm as npm/pnpm
    participant lib as build-lib.mjs
    participant cli as build-cli.mjs
    participant e2e as build-e2e.mjs
    participant tsc as TypeScript
    participant esbuild as esbuild
    participant dist as dist/

    Developer->>npm: pnpm run build
    npm->>npm: lint & gen-version & build-dom-scripts
    npm->>lib: node scripts/build-lib.mjs
    lib->>esbuild: bundle lib/index.ts
    esbuild->>dist: output dist/index.js (ESM)
    npm->>tsc: build-types (tsc --project tsconfig.build.json)
    tsc->>dist: emit .d.ts files only
    
    Developer->>cli: node scripts/build-cli.mjs
    cli->>esbuild: bundle evals/cli.ts
    esbuild->>dist: output dist/evals/cli.js (CJS)
    cli->>cli: copy config & set permissions
    cli->>npm: npm link (if enabled)
    
    Developer->>e2e: node scripts/build-e2e.mjs
    e2e->>e2e: collect .ts entry points
    e2e->>esbuild: bundle all deterministic tests
    esbuild->>dist: output to dist/playwright/
    e2e->>e2e: rewrite stagehand imports
    e2e->>e2e: patch import.meta compatibility

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[MagellaX]

Hey, i think u can merge this @seanmcguire12