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test(minvmd): give the vm_escape harness a package source for its boxes #1819
Description
Problem
crates/minvmd/tests/vm_escape_integration.rs (vm_escape_bounded_to_resident_union) has never executed its body: until #1815 it returned early whenever MINVMD_GVPROXY_BIN was unset, which is every lane. With the switch provisioned it fails on both VM lanes and locally at vm_escape_integration.rs:1147 ("box-a CapEff read exited nonzero").
The exec's stderr, which BoxSession::exec drops, says why:
minimald: failed to spawn process: session spawn: no such package: base
A shell exec runs /usr/bin/bash -c inside the session sandbox, and launching that sandbox resolves the baseline packages (base, coreutils, socat, plus bash) against the project's package graph. The harness uploads a task-only minimal.toml with no [upstream] (copied from minimald_session_integration.rs, which only runs an echo task that never spawns a sandbox), so the graph is empty.
Adding the pinned [upstream] moves the failure to git clone https://github.com/gominimal/pkgs: Could not resolve host: github.com in the harness boot (locally).
Wanted
The harness gives the box a package graph without depending on a live GitHub clone inside the guest: a seeded or offline package source (cache disk or prebuilt base/coreutils/socat/bash layer), or proven guest egress plus the pinned upstream with a cache. BoxSession::exec surfaces the exec's stderr on failure so the next failure names its cause.
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