Implement Bilingual Documentation (English/Spanish)

[google-labs-jules]

Established a bilingual documentation system with 'docs/docs/en' and 'docs/docs/es'. Created comprehensive English documentation translated from Spanish source, updated 'mkdocs.yml' for bilingual navigation, updated 'AGENTS.md' governance, and synced 'README.md' and 'LEEME.md' to reflect the new structure and SOTA 2026 standards.

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PR created automatically by Jules for task 8375426546586530030 started by @zarvent

[google-labs-jules]

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