feat(cybersecurity): 8 IoC regex extractors + extract_iocs pipeline puro

Extractores nuevos en python/functions/cybersecurity/:
- extract_ip_addresses (IPv4 + IPv6 con validacion ipaddress)
- extract_emails (RFC 5322 simplificado)
- extract_domains (FQDNs con TLD valido, lista estatica)
- extract_file_hashes (MD5/SHA1/SHA256/SHA512, algoritmo por longitud)
- extract_crypto_wallets (BTC legacy + bech32, ETH 0x+40hex)
- extract_cve_ids (CVE-YYYY-NNNN+)
- extract_mac_addresses (xx:xx:xx + xx-xx-xx, separador uniforme)
- extract_phone_numbers (E.164 + ES local 9 digitos)

Pipeline:
- extract_iocs corre todos, deduplica spans contenidos. Mantiene
  purity:pure (kind:function con uses_functions no vacio) porque la
  regla del registry exige que los pipelines sean impuros.

Todas devuelven list[dict] con value/start/end/type para que el
caller (issues 0038-0040) pueda reconciliar offsets con spans NER
sin reparsing.

Refs #0037

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

python/functions/cybersecurity/extract_crypto_wallets.md

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+---
+name: extract_crypto_wallets
+kind: function
+lang: py
+domain: cybersecurity
+version: "1.0.0"
+purity: pure
+signature: "def extract_crypto_wallets(text: str) -> list[dict]"
+description: "Extrae direcciones BTC (legacy P2PKH/P2SH + bech32) y ETH (0x + 40 hex) de un texto, con offsets y `asset` indicando la moneda. Validacion estructural por regex — no checksum."
+tags: [ioc, crypto, btc, eth, wallet, bitcoin, ethereum, regex, extract, cybersecurity, python]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: [re]
+params:
+  - name: text
+    desc: "string de texto del que extraer wallets"
+output: "lista de dicts con {value, start, end, type='crypto_wallet', asset} por cada direccion encontrada"
+tested: true
+tests:
+  - "BTC legacy (P2PKH y P2SH)"
+  - "BTC bech32 (segwit)"
+  - "ETH 0x + 40 hex"
+test_file_path: "python/functions/cybersecurity/tests/test_extract_iocs.py"
+file_path: "python/functions/cybersecurity/extract_crypto_wallets.py"
+---
+
+## Ejemplo
+
+```python
+extract_crypto_wallets("Send to 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa or 0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb1")
+# [{"value": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa", ..., "asset": "btc"},
+#  {"value": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb1", ..., "asset": "eth"}]
+```
+
+## Notas
+
+BTC legacy: empieza por `1` o `3`, base58 (sin 0/O/I/l), 26-35 chars. BTC bech32: prefijo `bc1`, alfabeto bech32. ETH: `0x` + 40 hex case-insensitive. No se valida checksum — un agente que requiera validacion completa debe correr base58check / EIP-55 sobre los `value` retornados.