Allow use on x86_64 systems

[ian-ross]

This PR uses the system architecture to decide which QEMU binary to run. Allows for use on x86_64 machines.

[mgabor3141]

@greptile

[greptile-apps]

Greptile Summary

This PR introduces qemuBinaryForHost() to select either qemu-system-aarch64 or qemu-system-x86_64 based on process.arch, then threads the resolved path through both checkQemuAvailable and the sandbox.qemuPath option in VM.create() — ensuring the preflight check and the actual VM launch always use the same binary. The previously noted gap where checkQemuAvailable could pass on an x86_64 host while VM.create() still hardcoded aarch64 is now fully addressed.

Confidence Score: 5/5

Safe to merge — the change is minimal, well-scoped, and correctly resolves the architecture mismatch for x86_64 hosts.

No P0 or P1 issues found. The previous P1 concern (VM.create() ignoring the architecture-specific binary) is addressed by passing qemuPath explicitly. Only a P2 documentation clarity nit remains.

No files require special attention.

Important Files Changed

Filename	Overview
packages/enclave/src/vm.ts	Adds qemuBinaryForHost() helper; threads the resolved binary into both checkQemuAvailable and VM.create() sandbox options — correctly closes the gap where the preflight check and VM launch could use different binaries.
packages/enclave/README.md	Install instructions updated for x86_64; minor wording ambiguity around the qemu-system-x86 package vs qemu-system-x86_64 binary name.
.changeset/red-vms-sneeze.md	Changeset entry for a patch bump with accurate description of the change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[EnclaveVM.start / checkQemuAvailable] --> B[qemuBinaryForHost]
    B --> C{process.arch}
    C -->|arm64| D[qemu-system-aarch64]
    C -->|x64| E[qemu-system-x86_64]
    C -->|other| F[undefined → error / unavailable]
    D --> G[execSync which …]
    E --> G
    G -->|found| H[VM.create sandbox.qemuPath]
    G -->|not found| I[return install hint]
    H --> J[Gondolin launches QEMU]

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/enclave/src/vm.ts:358
**Debian package name inconsistent with the binary**

The install hint for x86_64 suggests `qemu-system-x86`, but the binary that is actually checked and launched is `qemu-system-x86_64`. While `qemu-system-x86` is the correct Debian/Ubuntu package name (it ships `qemu-system-x86_64`), the README on line 10 also says `sudo apt install qemu-system-x86` — a user who copies that verbatim and then looks for a `qemu-system-x86` _binary_ will be confused. The hint would be clearer if it noted that the binary inside the package is `qemu-system-x86_64`.

```suggestion
			const debianPackage = process.arch === "arm64" ? "qemu-system-aarch64" : "qemu-system-x86";
			installHint = `Install with: sudo apt install ${debianPackage} (provides the ${qemuBinary} binary on Debian/Ubuntu) or sudo pacman -S qemu-full (Arch)`;
```

_{Reviews (2): Last reviewed commit: "Pass QEMU binary to enclave VM" | Re-trigger Greptile}

[mgabor3141]

Thank you!