feat: Hermit 1.1.0 — HERMIT_* env, Tauri desktop shell

Wire hermit_getenv across the engine, rebrand WebUI/systemd/docs, and
add apps/desktop (Tauri 2 + React) with a DeepSeek-Harness-like UI.
Qt app/ is frozen; full libcstcore FFI is scaffolded behind --features engine.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/bootstrap_termux.sh

@@ -1,13 +1,13 @@
 #!/data/data/com.termux/files/usr/bin/bash
-# Install or upgrade CST-Agent on Android Termux. Safe to rerun: an existing
+# Install or upgrade Hermit on Android Termux. Safe to rerun: an existing
 # checkout is fast-forwarded, rebuilt and reinstalled.
 #
 #   bootstrap_termux.sh [DIR] [--no-pull]
-#   cst-agent-update            (installed by this script; same as rerunning it)
+#   hermit-update               (installed by this script; same as rerunning it)
 set -euo pipefail
 
 main() {
-  local repo_url="${CST_AGENT_REPO:-https://git.whcself.xyz/WHC/CST-agent.git}"
+  local repo_url="${HERMIT_REPO:-${CST_AGENT_REPO:-https://git.whcself.xyz/WHC/Hermit.git}}"
   local dir="" pull=1 changed=0 arg
   for arg in "$@"; do
     case "$arg" in
@@ -21,10 +21,12 @@ main() {
     esac
   done
   if [[ -z "$dir" ]]; then
-    if [[ -n "${CST_AGENT_DIR:-}" ]]; then
-      dir="$CST_AGENT_DIR"
+    if [[ -n "${HERMIT_DIR:-${CST_AGENT_DIR:-}}" ]]; then
+      dir="${HERMIT_DIR:-$CST_AGENT_DIR}"
     elif [[ -f Makefile && -f src/main.c && -d .git ]]; then
       dir="$(pwd)"
+    elif [[ -d "$HOME/Hermit/.git" ]]; then
+      dir="$HOME/Hermit"
     else
       dir="$HOME/CST-agent"
     fi