diff --git a/.gitignore b/.gitignore
index 9c4e659..ece2016 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@
 .project_rules
 AGENTS.md
 build
+
+/build-ci/
diff --git a/README.md b/README.md
index aa3e7b2..0b2386c 100644
--- a/README.md
+++ b/README.md
@@ -1355,6 +1355,18 @@ source lists live in `tests/parser_tests.pri` and `tests/decoder_tests.pri`.
 When building a consumer separately, pass
 `DBC_CORE_BUILD_DIR=/absolute/path/to/build/core` to qmake.
 
+### Local core regression checks
+
+Run `bash tests/run_core_ci.sh release` or `bash tests/run_core_ci.sh sanitize`
+to build the core archive with Qt 6.8.2, run all six core QtTest suites (parser,
+decoder, coverage, lifetime, validation, and pipeline/builder integration), and
+run both the qmake and standalone Qt-free tree tests. The sanitizer mode uses
+AddressSanitizer and UndefinedBehaviorSanitizer, with leak detection enabled by
+default and fatal sanitizer errors.
+
+See [Local regression checks](tests/README.md#local-regression-checks) for
+prerequisites and environment overrides. No automatic CI workflow is configured.
+
 ### Build core without Qt libraries
 
 From the repository root:
diff --git a/changelog.md b/changelog.md
index eeed2d1..d0ae0b1 100644
--- a/changelog.md
+++ b/changelog.md
@@ -8,6 +8,15 @@ existing Git tag; subsequent changes are listed as unreleased.
 
 ### 2026-10-23
 
+#### Testing
+
+- Add local Release and ASan/UBSan commands in `tests/run_core_ci.sh` for the
+  core archive, all six core regression suites, and qmake/standalone tree tests,
+  with separate build directories and fatal test/sanitizer failures.
+- Verify clean Release and ASan/UBSan builds: each passed 2,397 QtTest checks
+  without skips plus qmake and standalone tree tests. Local leak checking is
+  blocked by ptrace. Validate shell syntax and build-failure propagation.
+
 #### Fixed
 
 - Read attribute definitions, defaults, and assignments across physical lines.
diff --git a/tests/README.md b/tests/README.md
index 3f8e589..dd0dac2 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -45,6 +45,39 @@ make check
 `dbc_validation_test.cpp`, and `dbc_pipeline_test.cpp`.
 `../core/core.pri` supplies the library include path and linkage.
 
+## Local regression checks
+
+`run_core_ci.sh` builds the core archive, runs all six QtTest suites and the
+qmake tree target with `make check`, then compiles and runs the standalone C++17
+tree/builder test without Qt. A failed command returns a nonzero status. The
+`sanitize` mode applies ASan/UBSan flags to core, tests, and the standalone
+executable, with leak detection enabled by default and sanitizer errors fatal.
+The optional adapter is not built. No automatic CI workflow is configured.
+
+From the repository root, with Qt 6.8.2 available:
+
+```sh
+bash tests/run_core_ci.sh release
+bash tests/run_core_ci.sh sanitize
+```
+
+Build directories default to `build-ci/release` and `build-ci/sanitize`; an
+optional second argument selects another directory. Always use separate build
+directories for the two modes. `QMAKE`, `CXX`, and `JOBS` override the qmake
+executable, standalone compiler, and build parallelism (default 4). Generate the
+locale as described below and set `LOCPATH` locally to run without locale skips.
+On hosts where LeakSanitizer cannot work under a tracer, run with
+`ASAN_OPTIONS=detect_leaks=0:halt_on_error=1`; this disables local leak checking
+only. Test output is written to the terminal.
+
+Validation of this script used clean builds in `/tmp/dbc-ci-release`
+and `/tmp/dbc-ci-sanitize` with Qt 6.8.2 and the generated German locale. Each
+mode passed 2,397 QtTest checks with no failures or skips, the qmake tree test,
+and the standalone tree test. The sanitizer run used `detect_leaks=0` because
+an explicit leak-enabled run failed with LeakSanitizer's ptrace restriction.
+Shell syntax, invalid-mode handling, and nonzero propagation of a failed qmake
+command were also checked.
+
 ## Decoder coverage
 
 Coverage includes Motorola bit numbering within and across bytes, unaligned
diff --git a/tests/run_core_ci.sh b/tests/run_core_ci.sh
new file mode 100644
index 0000000..8b9047d
--- /dev/null
+++ b/tests/run_core_ci.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Build core and run the local regression checks.
+set -euo pipefail
+
+mode=${1:-release}
+source_dir=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
+build_dir=${2:-"$source_dir/build-ci/$mode"}
+qmake_args=()
+compiler_flags=()
+
+case "$mode" in
+    release)
+        qmake_args+=(CONFIG+=release CONFIG-=debug)
+        compiler_flags+=(-O2)
+        ;;
+    sanitize)
+        qmake_args+=(CONFIG+=debug CONFIG-=release
+            'QMAKE_CXXFLAGS+=-fsanitize=address,undefined -fno-omit-frame-pointer'
+            'QMAKE_LFLAGS+=-fsanitize=address,undefined')
+        compiler_flags+=(-g -fsanitize=address,undefined -fno-omit-frame-pointer)
+        export ASAN_OPTIONS=${ASAN_OPTIONS:-detect_leaks=1:halt_on_error=1}
+        export UBSAN_OPTIONS=${UBSAN_OPTIONS:-halt_on_error=1:print_stacktrace=1}
+        ;;
+    *)
+        echo "Usage: $0 [release|sanitize] [build-directory]" >&2
+        exit 2
+        ;;
+esac
+
+export QT_FATAL_WARNINGS=${QT_FATAL_WARNINGS:-1}
+mkdir -p -- "$build_dir"
+cd -- "$build_dir"
+"${QMAKE:-qmake6}" "$source_dir/dbc.pro" "${qmake_args[@]}"
+make -j"${JOBS:-4}"
+make check
+
+# Also verify that the tree and its builder compile and run without Qt.
+"${CXX:-c++}" -std=c++17 "${compiler_flags[@]}" -I"$source_dir/core" \
+    "$source_dir/tests/tree_node_test.cpp" "$source_dir/core/tree_node.cpp" \
+    "$source_dir/core/dbc_tree_builder.cpp" -o dbc_tree_standalone_test
+./dbc_tree_standalone_test