fix: strengthen termux install network prerequisites

scripts/install.sh

@@ -615,6 +615,41 @@ install_node() {
     HAS_NODE=true
 }
 
+check_network_prerequisites() {
+    log_info "Checking internet connectivity for package install and web tools..."
+
+    local url
+    local failed=false
+    local checks=("https://pypi.org/simple/" "https://duckduckgo.com/")
+
+    if ! command -v curl >/dev/null 2>&1; then
+        log_warn "curl not found; skipping connectivity probes"
+        return 0
+    fi
+
+    for url in "${checks[@]}"; do
+        if ! curl -fsSI --max-time 8 "$url" >/dev/null 2>&1; then
+            failed=true
+            log_warn "Could not reach $url"
+        fi
+    done
+
+    if [ "$failed" = false ]; then
+        log_success "Internet connectivity looks good"
+        return 0
+    fi
+
+    if [ "$DISTRO" = "termux" ]; then
+        log_warn "Termux network prerequisites may be incomplete."
+        log_info "Try: pkg install -y ca-certificates curl && pkg update"
+        log_info "If mirrors are stale: termux-change-repo"
+        log_info "Then test: curl -I https://pypi.org/simple/ && curl -I https://duckduckgo.com/"
+    else
+        log_warn "Network checks failed. Hermes install may complete, but web search and dependency downloads can fail."
+        log_info "Verify internet/DNS and retry if pip install fails."
+    fi
+}
+
 install_system_packages() {
     # Detect what's missing
     HAS_RIPGREP=false
@@ -642,7 +677,7 @@ install_system_packages() {
     # Termux always needs the Android build toolchain for the tested pip path,
     # even when ripgrep/ffmpeg are already present.
     if [ "$DISTRO" = "termux" ]; then
-        local termux_pkgs=(clang rust make pkg-config libffi openssl)
+        local termux_pkgs=(clang rust make pkg-config libffi openssl ca-certificates curl)
         if [ "$need_ripgrep" = true ]; then
             termux_pkgs+=("ripgrep")
         fi
@@ -1570,6 +1605,7 @@ main() {
     check_python
     check_git
     check_node
+    check_network_prerequisites
     install_system_packages
 
     clone_repo

tests/test_install_sh_termux_network_prereqs.py

@@ -0,0 +1,22 @@
+"""Regression tests for Termux network prerequisite handling in install.sh."""
+
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+INSTALL_SH = REPO_ROOT / "scripts" / "install.sh"
+
+
+def test_termux_pkg_list_includes_network_basics() -> None:
+    text = INSTALL_SH.read_text()
+    assert "local termux_pkgs=(clang rust make pkg-config libffi openssl ca-certificates curl)" in text
+
+
+def test_install_script_has_connectivity_probe_and_termux_guidance() -> None:
+    text = INSTALL_SH.read_text()
+    assert "check_network_prerequisites()" in text
+    assert "https://pypi.org/simple/" in text
+    assert "https://duckduckgo.com/" in text
+    assert "termux-change-repo" in text
+    assert "pkg install -y ca-certificates curl && pkg update" in text
+    assert "check_network_prerequisites" in text