add wheels and update docs

README.md

@@ -1,6 +1,6 @@
 # pyhdwallet – Secure HD Wallet Tool
 
-A Python command-line tool for generating and recovering BIP39 HD wallets with support for Ethereum, Solana, and Bitcoin. Designed for offline operation with optional PGP encryption and AES-encrypted ZIP artifacts.
+A Python command-line tool for generating and recovering BIP39 HD wallets with support for Ethereum, Solana, and Bitcoin. Includes **BIP85 deterministic child mnemonic derivation** for creating multiple isolated wallets from a single master seed. Designed for offline operation with optional PGP encryption and AES-encrypted ZIP artifacts.
 
 ---
 
@@ -32,7 +32,7 @@ This repository includes pre-built Python wheels for offline use.
 
 **Supported platforms:**
 
-- macOS ARM64 (M1/M2/M3) - Python 3.12
+- macOS ARM64 (M1/M2/M3/M4) - Python 3.12
 - Linux x86_64 (Ubuntu/Tails) - Python 3.12
 
 **Steps:**
@@ -102,6 +102,22 @@ python src/pyhdwallet.py gen \
   --off-screen \
   --file
 
+# Derive BIP85 child mnemonic (12/15/18/21/24 words)
+python src/pyhdwallet.py gen-child \
+  --interactive \
+  --words 12 \
+  --index 0
+
+# Derive BIP85 child with passphrase + encrypted output
+python src/pyhdwallet.py gen-child \
+  --mnemonic-stdin \
+  --passphrase \
+  --words 24 \
+  --index 0 \
+  --pgp-pubkey-file pubkeys/mykey.asc \
+  --off-screen \
+  --file
+
 # Recover wallet from mnemonic
 python src/pyhdwallet.py recover --interactive --file
 
@@ -118,11 +134,13 @@ pytest -v tests/test_vectors.py
 ## 🔐 Security Features
 
 - **Offline-first**: Network access blocked during key generation/recovery
+- **BIP85 deterministic entropy**: Derive unlimited child mnemonics from master seed
 - **Test suite**: Regression tests with frozen vectors ensure derivation logic integrity
 - **PGP fingerprint pinning**: Prevents key substitution attacks
 - **TTY safety guard**: Refuses to print secrets when stdout is piped/redirected
 - **AES-encrypted outputs**: Wallet artifacts encrypted with `pyzipper`
 - **No shell history leaks**: Use `--interactive` or `--mnemonic-stdin` for recovery
+- **Interoperable**: BIP85 children compatible with Coldcard, Ian Coleman tool, etc.
 
 ---
 
@@ -170,3 +188,16 @@ For maximum security when generating production wallets:
 8. Wipe USB drives securely
 
 See [playbook.md](playbook.md) for detailed air-gapped procedures.
+
+---
+
+## 🆕 What's New in v1.0.6
+
+- **BIP85 child mnemonic derivation** via new `gen-child` command
+- Derive 12/15/18/21/24-word child mnemonics from master seed
+- Full interoperability with BIP85-compatible wallets (Coldcard, etc.)
+- Optional master BIP39 passphrase support
+- Verified against official BIP85 test vectors
+- No new dependencies required (uses existing bip-utils + stdlib)
+
+---