SD-305

[docs-structure] thepit-v2 has docs. Structure: docs/{doctype}/ with depth for airgap/archive/deep-archive. Previous “no docs directory” was a misunderstanding. DOMAIN.md files remain for architectural boundaries. Created: docs/research/, docs/decisions/, docs/archive/. Docs help tell the story afterwards — stored D3+ for historical and research purposes. Cold/hot context pressure definitions live in lexicon (< D2, they are terms like syntax at the HCI layer).

**STANDING**

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