GP_GRIN1_RAIL now defaults OFF. Unset/off, GoblinPay behaves like the pre-rail
server: no arti/Tor code path runs, no loopback Foreign API listener, no
invoice slates issued, and the pay page shows ONLY 'Pay with Goblin' (no
switcher, no grin1 UI, footer unchanged) — even for an invoice armed while the
rail was on. Enabled, the two-rail switcher renders with the Goblin tab
default-selected; the switcher chrome appears only when BOTH rails are
available (a single rail renders its panel directly).
- config: default flip + docs; env example + README gain the opt-in block.
- checkout: build_info gates all grin1 UI on the flag; tests for both states
(off => no rail-tab/rail-radio/panel-grin/grin1 strings; on => switcher with
rail-goblin checked).
- sqlx 0.8 -> 0.9 (workspace): its libsqlite3-sys range (<0.38) unifies with
arti's rusqlite, resolving the one-links-per-native-lib conflict that
otherwise forbids sqlx-sqlite + in-process arti in one binary. Feature map:
runtime-tokio + sqlite (bundled, as before); dynamic COLUMNS queries wrapped
in sqlx::AssertSqlSafe (compile-time composed strings).
2ro
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