[codex] Live Reliability / Variant Smoke (#3925)

* test: add variant reliability smoke coverage

* test: relax energy harness variant guard

* test: isolate variant harness layer defaults

* test: address greptile feedback on variant-smoke spec

- e2e/variant-live-smoke.spec.ts: document that expectedPanelFailures is
  intentionally diagnostic-only — keeping live-upstream blips out of the
  hard-assertion set — so future readers don't assume an assertion was
  forgotten (greptile P2).
- src/e2e/map-harness.ts: drop the redundant commodityPorts: true
  override in energyAllLayersEnabled. allLayersEnabled already sets
  this, so the override was a no-op after this PR's earlier diff
  (greptile P2, out-of-diff).
- package.json: include test:e2e:energy in the aggregate test:e2e
  script so CI exercises the existing energy guardrail when this
  variant smoke lands. commodity and happy stay excluded pending
  baselines (greptile P2).

* fix(e2e): restore commodityPorts override in energyAllLayersEnabled

The earlier greptile-feedback commit (8314a7f64) dropped this override
based on Greptile's claim that allLayersEnabled already set
commodityPorts: true. That observation reflected an older snapshot
(commit 3615509db) that was reverted by the 2fa60f2a8 isolation
refactor — in HEAD, allLayersEnabled.commodityPorts is false, so the
override IS load-bearing and removing it broke
tests/energy-variant-atlas-guard.test.mts which asserts the line
exists in the energy preset.

Restoring with an inline comment so a future review pass doesn't make
the same mistake. Energy needs the override because the harness ships
seeded port fixtures for the energy variant.