feat(supervisor): send metadata in compute sandbox creation requests

Pass business context (runId, envId, orgId, projectId, machine, etc.)
as metadata on CreateSandboxRequest instead of relying on env vars.
This enables wide event logging in the compute stack without parsing
env or leaking secrets.

Author: nicktrn

apps/supervisor/src/workloadManager/compute.ts

@@ -109,6 +109,15 @@ export class ComputeWorkloadManager implements WorkloadManager {
           body: JSON.stringify({
             image: imageRef,
             env: envVars,
+            metadata: {
+              runId: opts.runFriendlyId,
+              envId: opts.envId,
+              envType: opts.envType,
+              orgId: opts.orgId,
+              projectId: opts.projectId,
+              deploymentVersion: opts.deploymentVersion,
+              machine: opts.machine.name,
+            },
           }),
         })
       );