feat(infra): scope pre-commit test hook to staged packages (GOO-228)

Replace blanket `npm test` with lint-staged for linting/formatting and
a turbo --filter script that runs tests only for workspace packages
that have staged .ts/.tsx files.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.husky/pre-commit

@@ -1 +1,2 @@
-npm test
+npx lint-staged
+bash scripts/pre-commit-tests.sh

scripts/pre-commit-tests.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Detect which workspace packages have staged .ts/.tsx files and run tests
+# only for those packages via turbo --filter.
+
+STAGED_TS_FILES=$(git diff --cached --name-only --diff-filter=ACMR -- '*.ts' '*.tsx')
+
+if [ -z "$STAGED_TS_FILES" ]; then
+  exit 0
+fi
+
+FILTERS=""
+SEEN=""
+
+while IFS= read -r file; do
+  case "$file" in
+    apps/api/*)   pkg="@goodgo/api" ;;
+    apps/web/*)   pkg="@goodgo/web" ;;
+    libs/mcp-servers/*) pkg="@goodgo/mcp-servers" ;;
+    *) continue ;;
+  esac
+
+  if [[ ! " $SEEN " =~ " $pkg " ]]; then
+    SEEN="$SEEN $pkg"
+    FILTERS="$FILTERS --filter=$pkg"
+  fi
+done <<< "$STAGED_TS_FILES"
+
+if [ -z "$FILTERS" ]; then
+  exit 0
+fi
+
+echo "Running tests for affected packages:$SEEN"
+exec npx turbo run test $FILTERS