nx_social_auth_recover.nx

nx_social_auth_recover.nx -- the WIRING that makes elderly social recovery REAL: it connects the Shamir family-quorum primitive (nx_social_recovery) to actual account recovery (nx_modern_auth_recover), via the BIP39 codec. The recovery secret IS the entropy behind the user's issued mnemonic, so: ENROLL: decode the issued mnemonic -> its 256-bit entropy -> Shamir-split across N trusted contacts (K threshold). The USER HOLDS NOTHING; the family holds shares. RECOVER: K contacts reconstruct the entropy -> re-encode the mnemonic -> nx_modern_auth_recover (sets a new passphrase, rotates the mnemonic). K-1 reconstruct GARBAGE -> a wrong mnemonic -> refused. After a recovery the mnemonic rotates, so the caller MUST re-split the new mnemonic (nx_sar_enroll_split) for the next cycle. No seed phrase is ever handed to the user; the family quorum is the backup. Composes nx_social_recovery + nx_bip39 + nx_modern_auth_flow. license_tier: ORIGINAL