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+# Obsidian Project Knowledge Base Schema
+
+## Repository-local memory files
+
+- `.claude/project-memory/registry.yaml` — registry keyed by `project_id`
+- `.claude/project-memory/<project_id>.md` — compact project memory snapshot used on project turns
+
+Note: `registry.yaml` is currently JSON-formatted on disk for historical compatibility.
+
+Optional per-project registry fields:
+- `note_language` — note language for generated/synced notes. Supported values: `en`, `zh-CN`.
+
+Language resolution priority:
+1. project config in `.claude/project-memory/registry.yaml`
+2. environment variable `OBSIDIAN_NOTE_LANGUAGE`
+3. default `en`
+
+## Vault layout
+
+```text
+Research/{project-slug}/
+  00-Hub.md
+  01-Plan.md
+  Knowledge/
+  Papers/
+  Experiments/
+  Results/
+    Reports/
+  Writing/
+  Daily/
+  Archive/
+```
+
+## Role of each top-level location
+
+- `00-Hub.md` — project homepage, current state, must-remember numbers, key links
+- `01-Plan.md` — active goals, tasks, open questions, next actions
+- `Knowledge/` — stable project understanding such as background, research questions, method survey, data protocol, source inventory
+- `Papers/` — paper notes, literature summaries, related-work assets
+- `Experiments/` — experiment designs, runbooks, ablations, mechanism studies
+- `Results/` — canonical durable findings, diagnostics, figure/table indexes, cross-experiment conclusions
+- `Results/Reports/` — internal experiment round reports and batch retrospectives with stable naming
+- `Writing/` — paper drafting, slides, proposal text, rebuttal material
+- `Daily/` — daily logs, lightweight sync queue, scratch notes, meeting fragments
+- `Archive/` — inactive or historical material that should not stay in the main working surface
+
+## Minimum note types
+
+- `project`
+- `daily`
+- `paper`
+- `experiment`
+- `result`
+- `results-report`
+- `synthesis`
+- `meta`
+- `writing`
+- `task`
+
+## Main design rule
+
+This schema is intentionally small. Prefer a few durable notes over many placeholder notes.