`apply_reconciles_app_vars` drives the full cycle through `pic` against a
real server: a manifest `[vars] region = "eu"` is applied (var created +
injected — a script `vars::get("region")` returns "eu"), the value is
changed and re-applied (Update, returns "us"), then the var is dropped and
`apply --prune` removes it (`vars::get` resolves to `()` / JSON null).
Exercises the Bundle.vars wire, diff_vars create/update/delete, the in-tx
writes, and the runtime resolver end to end.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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