CLAUDE_CONFIG_DIR does not redirect user memory — ~/.claude/CLAUDE.md still loaded (undocumented)

**Version:** Claude Code v2.1.238, macOS (darwin 25.5)

**Setup:** A second, isolated environment via `CLAUDE_CONFIG_DIR=$HOME/.claude-vanilla`, which contains its own `CLAUDE.md`, `settings.json`, and skills.

**Observed:** `/context` in a session launched with the custom config dir lists **both** `$CLAUDE_CONFIG_DIR/CLAUDE.md` (and its `@`-imports, loaded without prompting) **and** `~/.claude/CLAUDE.md` — the literal default path — as loaded memory files. The "external includes" trust dialog fires for the `@`-import found in `~/.claude/CLAUDE.md`, naming that imported path. Declining keeps the import unresolved, but the pointer file itself still enters context in every session.

**Docs gap:** memory.md documents `~/.claude/CLAUDE.md` as user memory and sessions.md documents `CLAUDE_CONFIG_DIR` as relocating storage; neither specifies whether `~/.claude/CLAUDE.md` remains in the memory lookup under a custom config dir. Whichever behaviour is intended, it's currently unspecified — and the current behaviour breaks the isolated-second-environment use case (A/B baselining against vanilla, clean-room configs), since the default environment's memory leaks into the custom one.

**Repro:**
1. Put an `@`-import in `~/.claude/CLAUDE.md`.
2. Create `~/.claude-vanilla/` with its own `CLAUDE.md`.
3. `CLAUDE_CONFIG_DIR=~/.claude-vanilla claude`, then run `/context` → `~/.claude/CLAUDE.md` appears in memory files, and the trust dialog names its import.

**Ask:** document the intended lookup order under `CLAUDE_CONFIG_DIR`; ideally have it fully redirect user memory (or provide an explicit isolation flag).

Read memory.md and sessions.md, then reproduce the reported behavior with CLAUDE_CONFIG_DIR and /context. Trace how the documented user-memory locations relate to the custom config directory, and confirm the intended lookup order with maintainers. Done means the docs clearly specify whether ~/.claude/CLAUDE.md is loaded and how to obtain an isolated environment.

Rédigé par le modèle d'indexation à partir du texte de l'issue.