Exit works on plain-esplora regtest; human-readable ark status lines

submitPackage falls back to sequential /tx posts when the esplora lacks
POST /txs/package (regtest electrs) — works wherever the node relays
zero-fee v3 parents. The ark card stops speaking developer: in-flight
operations summarize as '{n} deposit(s) confirming' instead of
'board:funded, exit:chain, …', exit lines read 'Exiting N sats —
publishing on-chain…', and transient errors show 'hit a snag — retrying
automatically' instead of raw gRPC/HTTP text.

Co-Authored-By: Claude Fable 5 <[email protected]>

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