Add rewatch overview document

[cristianoc]

This document presents rewatch's core algorithms as typed functions, abstracting implementation details to expose fundamental computational patterns. It includes:

• Type vocabulary defining the build system's state space
• Diagrams illustrating one-shot build and watch mode flows
• Algorithms for package/module discovery, AST generation, dependency analysis, and topological compilation
• Discussion of patterns: graph traversal, parallel map, dirty propagation, ABI fingerprinting, topological scheduling
• Section on mapping to incremental/reactive computation primitives

The goal is to identify algorithmic building blocks that could be expressed using incremental and reactive computation primitives.

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commit: 8d831d8