Module context 

Context assembly types (DESIGN §9.5).

Structs

ContextBudget

ContextLayer

ContextResult

Enums

LayerKind

Functions

estimate_tokens_rough

Pre-load fallback token estimate (§7.5). Uses chars/4 — off by roughly fivefold on CJK (F27). Replaced by TokenizerPort::count() once the model tokenizer is available.