backend.md: Python routes, filesystem safety, persistence, scan state, model sidecars, and backend performance.
frontend.md: extension bootstrap, UI ownership, localization, media lifecycle, panel state, and graph mutations.
recipes.md: Workflow Recipes, packages, galleries, Parameter Notebooks, prompt roles, and recipe-to-model transitions.
material-library.md: generated-image snapshots, material assets, node-block reuse, and Model Doctor handoff.
recipe-model-lifecycle.md: authoritative model fields, Hash synchronization, local matching, partial append, and note privacy.
model-resolution.md: model provenance, Model Doctor, hash injection, deep scanning, and recovery policy.
../decisions/README.md: concise records of product and architectural decisions that still explain current behavior.

These documents describe current contracts rather than implementation history. For exact changes, use Git history. For user-visible releases, use CHANGELOG.md. For recurring implementation traps, use .agents/logs/ai_lessons.md.