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ff400.sh: CARD=0 is an index, not stable identity — writes can land on the wrong device #453

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@mkovero

Split out of #444 (PR #450 architect re-entry, 2026-09-14 comment on #444).

scripts/ff400.sh hardcodes CARD=0. On pupu the card index can move (the rig profile addresses the card by name for this reason — see #441 / docs/rigs/pupu.md). If card 0 is a different device on some boot, every amixer -c 0 ... write in this script lands on that device instead of the FF400, silently.

Architect's note (issue #444, re-entry): "silent-config defect... belongs in a separate issue, not this one."

Fix direction: resolve the card by name (e.g. via aplay -l / /proc/asound/cards matching "Fireface") rather than a literal index, the same class of fix #441 already applies elsewhere.

Not urgent enough to block #450; filed per qa's "bug found outside PR scope → open new issue" rule.

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