chore(config): add pre-push hook for GDScript and Rust linting

Runs GDScript parse check (headless Godot) and Rust lint (clippy +
fmt --check) before every push. Catches type inference errors and
formatting issues that code reviews missed in sprint 28.

Uses the existing .config/hooks/ infrastructure (core.hooksPath).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.config/hooks/pre-push

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+# Pre-push hook: lint GDScript and Rust before pushing.
+# Installed via: git config core.hooksPath .config/hooks
+set -euo pipefail
+
+REPO_ROOT="$(git rev-parse --show-toplevel)"
+ERRORS=0
+
+echo "pre-push: running lint checks..."
+
+# --- GDScript lint (headless Godot parse check) ---
+GODOT="${GODOT:-godot}"
+if command -v "$GODOT" >/dev/null 2>&1; then
+    echo "pre-push: checking GDScript..."
+    SCRIPT_ERRORS=$("$GODOT" --headless --path "$REPO_ROOT/client" --quit 2>&1 | grep -ci "SCRIPT ERROR" || true)
+    if [ "$SCRIPT_ERRORS" -gt 0 ]; then
+        echo "pre-push: FAIL — $SCRIPT_ERRORS GDScript error(s) found"
+        "$GODOT" --headless --path "$REPO_ROOT/client" --quit 2>&1 | grep -i "SCRIPT ERROR"
+        ERRORS=$((ERRORS + 1))
+    else
+        echo "pre-push: GDScript — OK"
+    fi
+else
+    echo "pre-push: WARNING — Godot not found, skipping GDScript lint"
+fi
+
+# --- Rust lint (clippy + fmt) ---
+if command -v cargo >/dev/null 2>&1 && [ -d "$REPO_ROOT/server" ]; then
+    echo "pre-push: checking Rust (clippy)..."
+    if ! (cd "$REPO_ROOT/server" && cargo clippy -- -D warnings 2>&1); then
+        ERRORS=$((ERRORS + 1))
+    else
+        echo "pre-push: clippy — OK"
+    fi
+
+    echo "pre-push: checking Rust (fmt)..."
+    if ! (cd "$REPO_ROOT/server" && cargo fmt --check 2>&1); then
+        ERRORS=$((ERRORS + 1))
+    else
+        echo "pre-push: fmt — OK"
+    fi
+else
+    echo "pre-push: WARNING — cargo not found or server/ missing, skipping Rust lint"
+fi
+
+if [ "$ERRORS" -gt 0 ]; then
+    echo ""
+    echo "pre-push: $ERRORS check(s) failed. Push aborted."
+    echo "  Fix the errors above, then try again."
+    exit 1
+fi
+
+echo "pre-push: all checks passed."