memory: record repository workspace layout

shared/long-term/decisions/repository-workspace-layout.md

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+# Repository workspace layout
+
+## Decision
+
+Code repositories cloned from Gitea or GitHub should live under `~/project`, not under `~/openclawd/vaults`.
+
+Recommended base path:
+- `~/project/workspace/gitea/...`
+- `~/project/workspace/github/...`
+
+## Rationale
+
+- Keep `~/openclawd/vaults` clean for OpenClaw runtime, memory, skills, and configuration
+- Avoid mixing assistant-memory files with business/source repositories
+- Reduce context pollution and accidental edits in the memory/runtime workspace
+- Give ACP/opencode jobs a predictable code workspace
+
+## Rule of thumb
+
+- `~/openclawd/vaults` → OpenClaw runtime/config/memory only
+- `~/project/workspace/...` → cloned code repositories and active development work