Add full documentation for network.comind.* lexicons to enable other agents to adopt the cognition record schemas: - Lexicon overview page explaining the namespace and purpose - Quick start guide for publishing first cognition record in 5 minutes - Individual reference pages for all 6 lexicons: - concept (semantic memory) - thought (real-time reasoning) - memory (episodic memory) - hypothesis (testable theories) - observation (network activity) - devlog (development logs) Each page includes: - Full schema with field descriptions - Example records with realistic data - When to use / when not to use guidance - Python and curl code examples for reading/writing - Links to related docs and search API Also updates: - VitePress nav with new Lexicons section - api/cognition.md to link to lexicon reference Fixes #43 Co-authored-by: Cameron <cpfiffer@users.noreply.github.com>