Fix stale references found by researcher agent

- docs/README-UPDATES.md: VAULT env var → VAULT_PATH (scripts check VAULT_PATH, not VAULT)
- tests/install-flow-walkthrough.md: "ctg alias" → "ctg script"; update read -r -p → read -rsp note

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: fidgetcoding

docs/README-UPDATES.md

@@ -117,15 +117,15 @@ After Step 7d installs the Obsidian MCP server, you might see "internal error" m
 
 ### `cbrain` says it can't find my vault
 
-The `cbrain` command searches a fixed list of common locations. If your vault isn't in one of these spots, set the `VAULT` environment variable:
+The `cbrain` command searches a fixed list of common locations. If your vault isn't in one of these spots, set the `VAULT_PATH` environment variable:
 
 ```bash
-VAULT=~/path/to/your/vault cbrain
+VAULT_PATH=~/path/to/your/vault cbrain
 ```
 
 Or add it permanently to your `~/.zshrc`:
 ```bash
-export VAULT="$HOME/path/to/your/vault"
+export VAULT_PATH="$HOME/path/to/your/vault"
 ```
 
 ### Status line doesn't show the brain emoji

tests/install-flow-walkthrough.md

@@ -220,9 +220,9 @@ The `obsidian-mcp` npm package may return internal errors at runtime. This is an
 
 | Section | Expected Behavior | Result |
 |---------|-------------------|--------|
-| Prerequisites | Checks claude, ctg alias, cbraintg | PASS |
+| Prerequisites | Checks claude, ctg script, cbraintg | PASS |
 | Existing config | No token file -- proceeds to prompt | PASS |
-| Token prompt (line 123) | Single `read -r -p` with skip message | PASS -- **BUG WAS FIXED** |
+| Token prompt (line 123) | Silent `read -rsp` with skip message (token hidden on paste) | PASS |
 | Empty input | Sets `SKIP_TOKEN=true`, continues | PASS |
 | Non-interactive (pipe) | `read` gets EOF, token is empty, skip path activates | PASS |