Skip hypertree root recomputation when signing SLH-DSA - #195
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The HT constructor always built the top-layer XMSS tree to derive the hypertree public key, so every signature repeated that build (about 1/d of key generation) to produce a value the private key already holds in PK.root. Only key generation needs it, and the signing path never reads it. Move the root computation out of the constructor into an explicit PKGen method that only the key pair generator calls; the constructor now just wires up the engine and WOTS+ state.
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The HT constructor always built the top-layer XMSS tree to derive the hypertree public key, so every signature repeated that build (about 1/d of key generation) to produce a value the private key already holds in PK.root. Only key generation needs it, and the signing path never reads it.
Move the root computation out of the constructor into an explicit PKGen method that only the key pair generator calls; the constructor now just wires up the engine and WOTS+ state.