refactor: archive GUI clients; keep minimal TUI with hooks/API

Move Qt/Tauri/full Web SPA under archive/, ship hermit as CLI/TUI plus
libcstcore and cst-webui/1 HTTP+SSE (turn lifecycle hooks, capabilities).

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

archive/desktop-tauri/src-tauri/build.rs

@@ -0,0 +1,175 @@
+fn main() {
+    // Optional: link a prebuilt libcstcore when HERMIT_CORE_LIB is set.
+    // Example:
+    //   HERMIT_CORE_LIB=/path/to/libcstcore.a HERMIT_CORE_INCLUDE=/path/to/include
+    //   cargo build --features engine
+    if std::env::var("CARGO_FEATURE_ENGINE").is_ok() {
+        let manifest_dir = std::path::PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
+        // src-tauri → desktop → apps → repo root
+        let repo_root = manifest_dir.join("../../..");
+        let include = std::env::var("HERMIT_CORE_INCLUDE").unwrap_or_else(|_| {
+            repo_root
+                .join("include")
+                .canonicalize()
+                .map(|p| p.display().to_string())
+                .unwrap_or_else(|_| repo_root.join("include").display().to_string())
+        });
+
+        let mut build = cc::Build::new();
+        build
+            .file("src/ffi_bridge.c")
+            .include(&include)
+            .include("src")
+            .warnings(false);
+        // libcstcore pulls C11 + POSIX.
+        build.std("c11");
+        build.compile("hermit_ffi_bridge");
+        println!("cargo:rerun-if-changed=src/ffi_bridge.c");
+        println!("cargo:rerun-if-changed=src/ffi_bridge.h");
+
+        let core = std::env::var("HERMIT_CORE_LIB")
+            .ok()
+            .map(std::path::PathBuf::from)
+            .filter(|p| p.exists())
+            .or_else(|| {
+                let fallback = repo_root.join("libcstcore.a");
+                fallback.exists().then_some(fallback)
+            });
+
+        if let Some(path) = core {
+            if let Some(dir) = path.parent() {
+                println!("cargo:rustc-link-search=native={}", dir.display());
+            }
+            let stem = path
+                .file_stem()
+                .and_then(|s| s.to_str())
+                .unwrap_or("cstcore")
+                .trim_start_matches("lib");
+            println!("cargo:rustc-link-lib=static={}", stem);
+            // libcstcore leaves sashidown symbols unresolved (same as Makefile LDLIBS).
+            let sashidown_dir = repo_root.join("vendor/sashidown");
+            let sashidown_a = sashidown_dir.join("libsashidown.a");
+            if sashidown_a.exists() {
+                println!(
+                    "cargo:rustc-link-search=native={}",
+                    sashidown_dir
+                        .canonicalize()
+                        .unwrap_or_else(|_| sashidown_dir.clone())
+                        .display()
+                );
+                println!("cargo:rustc-link-lib=static=sashidown");
+                println!("cargo:rerun-if-changed={}", sashidown_a.display());
+            } else {
+                println!(
+                    "cargo:warning=missing {} (make -C vendor/sashidown libsashidown.a)",
+                    sashidown_a.display()
+                );
+            }
+            link_curl_and_sys();
+            println!("cargo:rerun-if-changed={}", path.display());
+        } else {
+            println!(
+                "cargo:warning=feature engine enabled but HERMIT_CORE_LIB unset and libcstcore.a missing"
+            );
+        }
+        println!("cargo:rerun-if-env-changed=HERMIT_CORE_LIB");
+        println!("cargo:rerun-if-env-changed=HERMIT_CORE_INCLUDE");
+        println!("cargo:rerun-if-env-changed=HERMIT_CURL_LIBDIR");
+        println!("cargo:rerun-if-env-changed=PKG_CONFIG_PATH");
+        println!("cargo:rustc-env=HERMIT_CORE_INCLUDE={}", include);
+    }
+    tauri_build::build()
+}
+
+/// libcstcore needs libcurl (+ pthread/m/dl). On NixOS `-lcurl` alone fails
+/// because curl is not on the default linker path — resolve via pkg-config,
+/// HERMIT_CURL_LIBDIR, or `ldd $(command -v curl)`.
+fn link_curl_and_sys() {
+    if link_curl_via_pkg_config() || link_curl_via_env() || link_curl_via_ldd() {
+        // ok
+    } else {
+        println!("cargo:warning=libcurl path not found; falling back to -lcurl");
+        println!("cargo:rustc-link-lib=curl");
+    }
+    println!("cargo:rustc-link-lib=pthread");
+    println!("cargo:rustc-link-lib=m");
+    println!("cargo:rustc-link-lib=dl");
+}
+
+fn apply_pkg_libs(libs: &str) -> bool {
+    let mut saw_curl = false;
+    for tok in libs.split_whitespace() {
+        if let Some(dir) = tok.strip_prefix("-L") {
+            if !dir.is_empty() {
+                println!("cargo:rustc-link-search=native={dir}");
+            }
+        } else if let Some(lib) = tok.strip_prefix("-l") {
+            if lib == "curl" {
+                saw_curl = true;
+            }
+            println!("cargo:rustc-link-lib={lib}");
+        }
+    }
+    saw_curl
+}
+
+fn link_curl_via_pkg_config() -> bool {
+    let Ok(out) = std::process::Command::new("pkg-config")
+        .args(["--libs", "libcurl"])
+        .output()
+    else {
+        return false;
+    };
+    if !out.status.success() {
+        return false;
+    }
+    let libs = String::from_utf8_lossy(&out.stdout);
+    apply_pkg_libs(libs.trim())
+}
+
+fn link_curl_via_env() -> bool {
+    let Ok(dir) = std::env::var("HERMIT_CURL_LIBDIR") else {
+        return false;
+    };
+    if dir.is_empty() || !std::path::Path::new(&dir).is_dir() {
+        return false;
+    }
+    println!("cargo:rustc-link-search=native={dir}");
+    println!("cargo:rustc-link-lib=curl");
+    true
+}
+
+fn link_curl_via_ldd() -> bool {
+    // Parse: libcurl.so.4 => /nix/store/.../lib/libcurl.so.4 (0x...)
+    let script = r#"
+set -e
+bin=$(command -v curl 2>/dev/null || true)
+[ -n "$bin" ] || exit 1
+ldd "$bin" 2>/dev/null | awk '/libcurl\.so/ { print $3; exit }'
+"#;
+    let Ok(out) = std::process::Command::new("sh")
+        .arg("-c")
+        .arg(script)
+        .output()
+    else {
+        return false;
+    };
+    if !out.status.success() {
+        return false;
+    }
+    let so = String::from_utf8_lossy(&out.stdout);
+    let so = so.trim();
+    if so.is_empty() || so == "not" {
+        return false;
+    }
+    let path = std::path::Path::new(so);
+    let Some(dir) = path.parent() else {
+        return false;
+    };
+    if !dir.is_dir() {
+        return false;
+    }
+    println!("cargo:rustc-link-search=native={}", dir.display());
+    println!("cargo:rustc-link-lib=curl");
+    true
+}