Simplify notation syntax and reframe format philosophy

[tcdent]

Remove unintuitive brief form operators (<=, <>, ><, //) in favor of
natural language. Keep only universally intuitive symbols: =>, ~, =, vs.

Key changes:

• Reduce brief forms from 8 to 4 operators
• Reframe format purpose: constraint enforcement over token efficiency
• Add LLM-Native Tokens section explaining why specific symbols work
• Update examples to use natural language for complex relationships

The format now emphasizes that:

1. Structure enforces what can/cannot be stored
2. Symbols leverage pre-existing LLM semantic associations
3. Natural language is preferred for uncommon relationships