feat(zcash): forward Ironwood PCZT metadata

[BitHighlander]

Why

The device must receive the selected Orchard-family pool and all five transaction-v6 component digests. Without these fields, firmware cannot safely authorize an Ironwood transaction.

What changed

• forward pool as the protocol shielded-pool selector
• forward digests.ironwood
• handle the new enum export in the message registry
• update shield/deshield fixtures to NU6.3 transaction v6 and assert exact wire fields
• stage the device-protocol 7.17.0 dependency

Validation

• yarn tsc --build packages/hdwallet-keepkey/tsconfig.json — passed against the generated 7.17.0 protocol
• focused Zcash Jest suite — 5/5 passed

Dependency

• feat(zcash): add NU6.3 Ironwood signing metadata BitHighlander/device-protocol#37 must merge and publish 7.17.0 before this PR can refresh yarn.lock and leave draft.

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Project	Deployment	Actions	Updated (UTC)
hdwallet-sandbox	Error		Jul 30, 2026 7:13pm

[BitHighlander]

Closing this staging attempt because it depended on an unpublished fork-scoped protocol package. The Ironwood firmware release is following the upstream-first SOP with keepkey/device-protocol#113 and keepkey/python-keepkey#200 at the canonical protocol pin f2246cebea8f96fcd7ec2883588a784a60b430ae. Any JS consumer follow-up will be rebuilt against the canonical upstream package, not a fork pin.