Move nip44 decryption off the main thread — the remaining boot secp256k1 after verification moved off (chunk-60dfb4nt in profiles). The verify worker grows two ops: 'openWraps' opens community (Concord) wraps given the symmetric stream conversation key — nip44 decrypt + the seal's schnorr verify + hash checks per wrap, no secret crossing the thread boundary since stream keys are group material; 'unwrapDMs' runs the full NIP-17 unwrap (two ECDH ops + seal verify) when the wallet holds the raw identity key. Remote signers can't export their key, so their DM path stays on the main thread, exactly as before. The time-sliced main-thread queues survive as fallbacks — a dead or stalled worker only changes WHERE the crypto runs (workerCrypto resolves null and callers re-enqueue), never whether chat catches up. Bonus: subChannel derives its stream key once per channel instead of once per wrap (groupKey does hkdf + ECDH per call — real curve work on a 200-wrap backfill)

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MGzU12QrAA4G6BYGzGVdXz

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