fix: resolve container OOM hangs from tsgo and --memory flag

Two issues caused containers to hang indefinitely:

1. Apple Container's `--memory` flag treats bare numbers as bytes, not
   megabytes. `--memory 1024` = 1024 bytes, causing the VM to never boot.
   Fix: use proper suffix (`--memory 4G`).
   Ref: apple/container#1202
   Ref: apple/container#1208

2. tsgo (TypeScript native compiler) has no default memory ceiling — Go
   doesn't auto-detect container memory limits, so tsgo allocates unbounded
   memory until the VM hangs under memory pressure.
   Fix: set GOMEMLIMIT=3GiB in entrypoint.
   Ref: microsoft/typescript-go#2125

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Peyton-Spencer

container/entrypoint.sh

@@ -7,6 +7,11 @@ set -e
 # Cap JS heap to prevent OOM
 export NODE_OPTIONS="--max-old-space-size=2048"
 
+# Cap Go heap for tsgo (TypeScript native compiler) — Go doesn't auto-detect
+# container memory limits, so without this tsgo allocates unbounded memory and hangs.
+# See: https://github.com/microsoft/typescript-go/issues/2125
+export GOMEMLIMIT=3GiB
+
 # Configure git with GitHub token
 if [ -n "$GITHUB_TOKEN" ]; then
   gh auth setup-git 2>/dev/null || true

src/backends/local-backend.ts

@@ -231,7 +231,7 @@ function buildVolumeMounts(
 }
 
 function buildContainerArgs(mounts: VolumeMount[], containerName: string): string[] {
-  const args: string[] = ['run', '-i', '--rm', '--name', containerName];
+  const args: string[] = ['run', '-i', '--rm', '--memory', '4G', '--name', containerName];
 
   for (const mount of mounts) {
     if (mount.readonly) {