CLAUDE.md authoring & maintenance

The meta-skill for keeping memory files load-bearing. Grounded in Anthropic's own docs (code.claude.com/docs/en/memory + /best-practices), not opinion. The one rule under all the others: CLAUDE.md loads in full every session as an advisory user message — every line costs tokens on every turn and competes for adherence. Smaller and sharper beats bigger.

The non-negotiables (from Anthropic)