archetech / archon / 22152405218 / 1

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feat: Adopt W3C JWE standard for encryption (#90)

* feat: Adopt W3C JWE standard for encryption

Replace custom ECIES (secp256k1 ECDH + XChaCha20-Poly1305) with
standard JWE Compact Serialization (ECDH-ES + A256GCM) per the
W3C VC-JOSE-COSE spec. Built using existing @noble primitives to
maintain browser compatibility (Web Crypto doesn't support secp256k1).

Backward compatible: legacy ciphertext is auto-detected and decrypted
via decryptMessageLegacy/decryptBytesLegacy methods.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Remove redundant fields

* Wallet fix

* refactor: Move JWE/legacy compat logic into cipher-base

The decrypt methods now accept an optional legacyPubKey parameter,
centralizing format detection. Removes decryptMessageCompat and
decryptBytesCompat from keymaster.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix python test

* Wallet fixes

* Updated archon version

* Fixes for copilot

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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