Remove collab directory - AIOS-Public serves as a template for projects, not a project using collab system itself

collab/README.md

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-# Collaboration Directory
-
-This directory contains structured collaboration artifacts for project development and decision-making.
-
-## Directory Structure
-
-- `questions/` - Outstanding questions and topics for discussion
-- `proposals/` - Formal proposals for new features, changes, or implementations  
-- `plans/` - Detailed implementation plans and technical designs
-- `prompts/` - Structured prompts for AI agents and automation
-- `audit/` - Audit trails, reviews, and assessment records
-
-## Usage Guidelines
-
-### Questions
-- Add new questions that need discussion or clarification
-- Link related proposals or plans where appropriate
-- Track resolution status
-
-### Proposals
-- Create formal proposals for significant changes or additions
-- Include business rationale and technical approach
-- Document expected outcomes and resource requirements
-- Seek approval before implementation
-
-### Plans
-- Detail technical implementation plans
-- Include architecture diagrams, technology stacks, and implementation phases
-- Identify risks and mitigation strategies
-- Outline next steps and dependencies
-
-### Prompts
-- Store reusable prompts for AI agents
-- Document prompt effectiveness and outcomes
-- Version prompts for different use cases
-
-### Audit
-- Track decisions made and their outcomes
-- Document performance reviews and assessments
-- Record lessons learned and improvements