5bfcbcb8e9
Remaining P3 item: - tangent_pull: maintain G1 tangency when pulling faces System infrastructure: - Unified ErrorCode (0-7xxx): ErrorInfo with Chinese messages - Version system: VDE_VERSION_MAJOR/MINOR/PATCH macros, vde_version() → VersionInfo, vde_version_string() - License management: LicenseTier (Community/Professional/Enterprise), LicenseKey (VDE-XXXX-XXXX, Base32 + HMAC-SHA256 signature), LicenseManager singleton with trial support - Convenience header: vde/vde_version.h Tests: 43 total (26 license + 17 version)