Migration 0009 adds invoice.rail/slate_id/slatepack. New invoice functions:
- attach_grin1: arm an invoice on the grin1 rail with the issued I1 slate id
and armored slatepack.
- get_by_slate_id: look up the invoice a returning finalize settles.
- plain_send_allowed: the Phase-3 render gate (no jitter) — only the earliest
open grin1 invoice for a given exact amount may show the plain-send address
panel; newer amount collisions hide it. Ordered by rowid (true insertion
order), amountless/off-rail invoices never show plain-send.
Config: GP_GRIN1_RAIL (default on) + GP_GRIN1_FOREIGN_PORT (default 3416).
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