Deep coins are renewed under every tier, free of the base fee, before the server's depth cap strands them

A coin's exit depth grows by one per off-chain hop; the server refuses to
cosign a spend of a coin at max_vtxo_exit_depth (100), so a wallet paying
hourly from one change chain has an unspendable coin within days. Survey of
the ASP's 2,279 unspent coins: median depth 7, 154 coins past 40 holding
7.7k sats, five already stuck at the cap.

The server now waives the refresh base fee when every input is at its
deep_waiver_depth (60; ArkInfo.fees.refresh carries it). The client mirrors
that in refreshFee, never selects a capped coin as an input (the shortfall
message says why), and flattens deep coins whatever the custody tier: the
open app in a round of their own, the worker with a standing order two
blocks out per coin. The default tier's copy names the one exception.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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