security: sanitized demos and README path fix

Author: greynewell

README.md

@@ -18,7 +18,7 @@ open http://127.0.0.1:4173/
 ## Files
 
 - `index.html`: landing page with embedded CSS and no build step.
-- `assets/graphtheory-profile.webp`: optimized hero image derived from `/Users/grey/Downloads/IMG_6295.jpg`.
+- `assets/graphtheory-profile.webp`: optimized hero image (local source file not committed).
 - `assets/demos/*.gif`: 30s VHS terminal demos synced from project repos (`scripts/sync_demo_gifs.sh`).
 - `assets/og-image.png`: 1200x630 share card.
 - `assets/favicon.svg`, `assets/favicon.png`, `assets/apple-touch-icon.png`, `assets/site.webmanifest`: identity assets.

demos/vhs/demo-30s.tape

@@ -14,6 +14,8 @@ Type "ls assets" Enter
 Sleep 3s
 
 Hide
+Type "source demos/vhs/sanitize-recording-env.sh" Enter
+Sleep 300ms
 Type "python3 -m http.server 4173 >/tmp/gt-demo-http.log 2>&1 &" Enter
 Sleep 1s
 Type "curl -s http://127.0.0.1:4173/ | head -20" Enter
@@ -25,4 +27,4 @@ Show
 Type "# Zero build step · python3 -m http.server 4173" Enter
 Sleep 3s
 Type "open https://graphtheory.xyz/" Enter
-Sleep 3s
+Sleep 3s

demos/vhs/sanitize-recording-env.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Public-safe shell identity for VHS terminal recordings.
+# Sources demos/vhs/env.sh after setting HOME/USER (real repo paths stay on disk).
+set -euo pipefail
+_VHS_SANITIZE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+_REPO_ROOT="$(cd "$_VHS_SANITIZE_DIR/../.." && pwd)"
+
+export VHS_RECORDING=1
+export HOME="$_REPO_ROOT/demos/vhs/staging/home/graphtheory"
+export USER=graphtheory
+export LOGNAME=graphtheory
+export HOSTNAME=cyber
+
+mkdir -p "$HOME/users/graphtheory/projects"
+_WORKSPACE="$HOME/users/graphtheory/projects/$(basename "$_REPO_ROOT")"
+ln -sfn "$_REPO_ROOT" "$_WORKSPACE"
+
+export PS1='graphtheory@cyber:~/users/graphtheory/projects/'"$(basename "$_REPO_ROOT")"'$ '
+export PROMPT_COMMAND=
+
+cd "$_WORKSPACE"
+
+# shellcheck source=env.sh
+source "$_VHS_SANITIZE_DIR/env.sh"

demos/vhs/staging/home/graphtheory/users/graphtheory/projects/codegraphtheory.github.io

@@ -0,0 +1 @@
+/Users/grey/Projects/codegraphtheory.github.io