Fix yarn.lock stale dependency causing benchmark workflow failure

[Copilot]

The benchmark workflow failed due to a lockfile mismatch. The yarn.lock contained @aglocal/benchmark: workspace:* as a dependency of @aglocal/boot, but this dependency was absent from packages/boot/package.json.

Root Cause

The run-bench.js script executes benchmarks via direct file path using execFileSync:

const BENCHMARK_SCRIPT = join(
  __dirname,
  '..',
  'benchmark',
  'benchmark',
  'benchmark-stress-vaults.js',
);

execFileSync('node', [BENCHMARK_SCRIPT, ...]);

No module dependency on @aglocal/benchmark is needed.

Changes

• Removed stale "@aglocal/benchmark": "workspace:*" entry from @aglocal/boot dependencies in yarn.lock
• Removed duplicate workspace:* variant from @aglocal/benchmark package descriptor

The lockfile now matches the package.json state, allowing yarn install --immutable to pass in CI.

Original prompt

Reference: https://github.com/Snapp949/agoric-sdk/actions/runs/20874564653/job/59981969357

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