chore(build): rename esbuild configs for clarity

Rename config files to shorter, consistent names:
- esbuild.cli.build.mjs -> esbuild.cli.mjs
- esbuild.config.mjs -> esbuild.build.mjs (orchestrator)
- esbuild.index.config.mjs -> esbuild.index.mjs
- esbuild-shared.mjs -> esbuild-utils.mjs

Refactor esbuild-utils.mjs:
- Replace createBuildRunner() with async runBuild() that properly
  rethrows errors (enables allSettled rejection detection)
- Import esbuild statically instead of dynamically
- Use logger instead of console

Update all import paths in:
- packages/cli/scripts/ (build.mjs, build-js.mjs, cover.mjs, etc.)
- packages/package-builder/templates/ (cli-package, cli-sentry-package)
- docs/build-guide.md
- packages/build-infra/README.md

Author: jdalton

docs/build-guide.md

@@ -284,23 +284,25 @@ pnpm clean
 
 Located in `packages/cli/.config/`:
 
-| Config                     | Output          | Description        |
-| -------------------------- | --------------- | ------------------ |
-| `esbuild.cli.build.mjs`    | `build/cli.js`  | Main CLI bundle    |
-| `esbuild.index.config.mjs` | `dist/index.js` | Entry point loader |
+| Config               | Output          | Description                                      |
+| -------------------- | --------------- | ------------------------------------------------ |
+| `esbuild.cli.mjs`    | `build/cli.js`  | Main CLI bundle — bundles all source into one JS |
+| `esbuild.index.mjs`  | `dist/index.js` | Entry point loader — thin shim that loads cli.js |
+| `esbuild.build.mjs`  | (orchestrator)  | Runs both cli and index builds in parallel       |
 
 ### Build Variants
 
-The unified esbuild config (`esbuild.config.mjs`) orchestrates all variants:
+The orchestrator (`esbuild.build.mjs`) accepts an optional variant argument:
 
 ```bash
-# Build all variants
-node .config/esbuild.config.mjs all
+# Build all variants (default)
+node .config/esbuild.build.mjs
 
-# Build specific variant
-node .config/esbuild.config.mjs cli
-node .config/esbuild.config.mjs index
-node .config/esbuild.config.mjs inject
+# Build only the CLI bundle
+node .config/esbuild.build.mjs cli
+
+# Build only the entry point loader
+node .config/esbuild.build.mjs index
 ```
 
 ---

packages/build-infra/README.md

@@ -272,7 +272,7 @@ ensureOutputDir('/path/to/output/file.js')
 ### esbuild Configuration
 
 ```javascript
-// .config/esbuild.cli.build.mjs
+// .config/esbuild.cli.mjs
 import { IMPORT_META_URL_BANNER } from 'build-infra/lib/esbuild-helpers'
 import { unicodeTransformPlugin } from 'build-infra/lib/esbuild-plugin-unicode-transform'
 
@@ -413,7 +413,7 @@ Assets are cached per tag to avoid re-downloading across builds.
 
 **Consumers:**
 
-- `packages/cli/.config/esbuild.cli.build.mjs` - Main CLI bundle config
+- `packages/cli/.config/esbuild.cli.mjs` - Main CLI bundle config
 - `packages/cli/scripts/download-assets.mjs` - Unified asset downloader
 - `packages/cli/scripts/sea-build-utils/builder.mjs` - SEA binary builder
 

packages/cli/.config/esbuild.build.mjs

@@ -0,0 +1,58 @@
+/**
+ * esbuild build orchestrator for Socket CLI.
+ * Builds all variants (CLI bundle + entry point) in parallel.
+ *
+ * Usage:
+ *   node .config/esbuild.build.mjs          # Build all variants
+ *   node .config/esbuild.build.mjs cli      # Build CLI bundle
+ *   node .config/esbuild.build.mjs index    # Build entry point
+ */
+
+import { fileURLToPath } from 'node:url'
+
+import { getDefaultLogger } from '@socketsecurity/lib/logger'
+
+import { runBuild } from '../scripts/esbuild-utils.mjs'
+import cliConfig from './esbuild.cli.mjs'
+import indexConfig from './esbuild.index.mjs'
+
+const logger = getDefaultLogger()
+
+export const CONFIGS = {
+  __proto__: null,
+  cli: cliConfig,
+  index: indexConfig,
+}
+
+async function main() {
+  const variant = process.argv[2] || 'all'
+
+  if (variant !== 'all' && !(variant in CONFIGS)) {
+    logger.error(`Unknown variant: ${variant}`)
+    logger.error(`Available variants: all, ${Object.keys(CONFIGS).join(', ')}`)
+    process.exitCode = 1
+    return
+  }
+
+  const targets =
+    variant === 'all'
+      ? Object.entries(CONFIGS)
+      : [[variant, CONFIGS[variant]]]
+
+  const results = await Promise.allSettled(
+    targets.map(({ 0: name, 1: config }) => runBuild(config, name)),
+  )
+  const failed = results.filter(r => r.status === 'rejected')
+  if (failed.length > 0) {
+    process.exitCode = 1
+  }
+}
+
+if (fileURLToPath(import.meta.url) === process.argv[1]) {
+  main().catch(error => {
+    logger.error('Build failed:', error)
+    process.exitCode = 1
+  })
+}
+
+export default CONFIGS