ci: unify rust quality gate and add incremental docs/link checks

scripts/ci/docs_links_gate.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+BASE_SHA="${BASE_SHA:-}"
+DOCS_FILES_RAW="${DOCS_FILES:-}"
+
+LINKS_FILE="$(mktemp)"
+trap 'rm -f "$LINKS_FILE"' EXIT
+
+python3 ./scripts/ci/collect_changed_links.py \
+    --base "$BASE_SHA" \
+    --docs-files "$DOCS_FILES_RAW" \
+    --output "$LINKS_FILE"
+
+if [ ! -s "$LINKS_FILE" ]; then
+    echo "No added links detected in changed docs lines."
+    exit 0
+fi
+
+if ! command -v lychee >/dev/null 2>&1; then
+    echo "lychee is required to run docs link gate locally."
+    echo "Install via: cargo install lychee"
+    exit 1
+fi
+
+echo "Checking added links with lychee (offline mode)..."
+lychee --offline --no-progress --format detailed "$LINKS_FILE"