Air-gapped PSP crypto wallet vault and offline signing demo

GOAL: Build 'PSP-Vault': a bare-metal, air-gapped hardware crypto wallet firmware (EBOOT.PBP) for Sony PSP (MIPS R4000 CPU, 480x272 screen, 32MB RAM) using PSPSDK in pure C. MOTION: Zero network libraries, zero WLAN drivers loaded. Entropy & Keys: Generate 256 bits of entropy by capturing microsecond hardware timer jitter across 256 physical button presses and analog stick movements. Implement clean BIP-39 (24-word mnemonic), BIP-32/BIP-44 hierarchical deterministic derivation, and secp256k1 + ed25519 signing for BTC, ETH, and SOL. Verification First: Before building the PSP binary, write and run a host C test that verifies 100 test vectors for BIP-39 seed generation, private key derivation, and ECDSA/EdDSA signatures against standard reference outputs. Do not proceed until 100% pass. Storage & Encryption: Encrypt the master seed on the Memory Stick (ms0:/PSP/SAVEDATA/VAULT/) using AES-256-GCM derived from a physical button-combo PIN (D-pad + face buttons, minimum 8 inputs) via PBKDF2. Wipe all plaintext key material from RAM immediately after signing using volatile zeroing. Offline Transaction Signing: Read unsigned raw transactions (JSON/hex) from a dedicated transfer folder on the Memory Stick, parse destination address, amount, chain ID, and gas/fee on screen for human verification, require a physical 3-second hold on R-Trigger + X to sign, and output the signed hex + on-screen QR code. UI (480x272 @ 60fps via PSP GU): Clean dark-mode terminal aesthetic. Show live entropy progress bar during button mashing, paginated 24-word seed verification test, address viewer with QR rendering, and transaction inspector. Pressing L+R simultaneously immediately zeroes RAM and locks the vault. Memory & Security Audit: Keep total RAM footprint under 4MB so it runs on both PSP-1000 (32MB) and PSP-2000/3000 (64MB). Run a separate security review agent to check for buffer overflows, side-channel leaks, and unzeroed heap allocations. Compile the final EBOOT.PBP inside Docker (pspdev/pspdev) and give me the exact steps to copy it to the PSP over USB.