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>

tests/test_llm_body.c

@@ -2,6 +2,7 @@
 #include "cst_agent.h"
 #include "cst_attach.h"
 #include "cst_test_util.h"
+#include "cst_hermit_glyph.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -299,8 +300,8 @@ static void test_cache_hints(void) {
 }
 
 static void test_kimi_wire_format(void) {
-  const char *old_no_cache = getenv("CST_NO_CACHE_HINTS");
-  const char *old_ttl = getenv("CST_KIMI_CACHE_TTL");
+  const char *old_no_cache = hermit_getenv("NO_CACHE_HINTS");
+  const char *old_ttl = hermit_getenv("KIMI_CACHE_TTL");
   char *saved_no_cache = old_no_cache ? strdup(old_no_cache) : NULL;
   char *saved_ttl = old_ttl ? strdup(old_ttl) : NULL;
   setenv("CST_NO_CACHE_HINTS", "0", 1);