docs: Create comprehensive ix wiki pages Add 5 wiki pages covering the ix repo: - Home: Overview, ecosystem relationships, algorithm domains - Architecture: Workspace structure, tech stack, MCP federation, crate layers - Governance: Constitutional hierarchy, policies, tetravalent logic, state directory - Getting-Started: Prerequisites, build, test, run, examples, contributing - ML-Pipelines: DAG pipelines, governance feedback loop, bootstrapping phases Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>