diff --git a/.opencode/agents/cmake-expert.md b/.opencode/agents/cmake-expert.md
index 211f104..e93cecc 100644
--- a/.opencode/agents/cmake-expert.md
+++ b/.opencode/agents/cmake-expert.md
@@ -27,16 +27,19 @@ FetchContent_Declare(xxhash GIT_REPOSITORY https://github.com/Cyan4973/xxHash GI
 FetchContent_MakeAvailable(xxhash)
 
 # Sanitizer option
-set(SANITIZER "none" CACHE STRING "Sanitizer to enable (address, thread, none)")
-set_property(CACHE SANITIZER PROPERTY STRINGS address thread none)
+set(SANITIZER "none" CACHE STRING "Sanitizer to enable (address, thread, undefined, none)")
+set_property(CACHE SANITIZER PROPERTY STRINGS address thread undefined none)
 if(SANITIZER STREQUAL "address")
   add_compile_options(-fsanitize=address -fno-omit-frame-pointer -g)
   add_link_options(-fsanitize=address)
 elseif(SANITIZER STREQUAL "thread")
   add_compile_options(-fsanitize=thread -fno-omit-frame-pointer -g)
   add_link_options(-fsanitize=thread)
+elseif(SANITIZER STREQUAL "undefined")
+  add_compile_options(-fsanitize=undefined -fno-omit-frame-pointer -g)
+  add_link_options(-fsanitize=undefined)
 elseif(NOT SANITIZER STREQUAL "none")
-  message(FATAL_ERROR "Unknown sanitizer: ${SANITIZER}. Supported values: address, thread, none")
+  message(FATAL_ERROR "Unknown sanitizer: ${SANITIZER}. Supported values: address, thread, undefined, none")
 endif()
 
 option(STRICT_WARNINGS "Enable strict warnings" OFF)
@@ -94,7 +97,7 @@ tests/integration/ — Python pytest integration tests
 - Use `file(GLOB ...)` for source collection (existing pattern).
 - All targets link `Threads::Threads`, `${ZSTD_LIBRARY}`, `OpenSSL::SSL`, `OpenSSL::Crypto`, and `xxhash`.
 - Include directories: `src/shared`, `src/server`, `src/client`, `tests` (for test target).
-- Sanitizer support: pass `-DSANITIZER=address` or `-DSANITIZER=thread` to cmake (live option in CMakeLists.txt).
+- Sanitizer support: pass `-DSANITIZER=address`, `-DSANITIZER=thread`, or `-DSANITIZER=undefined` to cmake (live option in CMakeLists.txt).
 - Build with `cmake -B build -S . && cmake --build build -j$(nproc)`.
 - For CI, dependencies are provided by the project's custom Docker image (repo-root `Dockerfile`, same image CI uses). For local development, use `nix-shell`. Never add `apt-get install` / `pip install` to CI workflows. See `AGENTS.md`.
 
@@ -105,7 +108,7 @@ tests/integration/ — Python pytest integration tests
 3. Add new dependencies with `find_package` or `find_library`.
 4. When adding a new executable target, follow the pattern of existing targets.
 5. When adding a new library (static/shared), use `add_library` and follow the project's naming.
-6. For sanitizer builds, pass `-DSANITIZER=address` or `-DSANITIZER=thread` to cmake (matching CI's matrix strategy).
+6. For sanitizer builds, pass `-DSANITIZER=address`, `-DSANITIZER=thread`, or `-DSANITIZER=undefined` to cmake (matching CI's matrix strategy).
 7. Always verify the build compiles after changes.
 
 ## Sanitizer Configurations
@@ -119,11 +122,9 @@ cmake -B build -S . -DSANITIZER=thread    # ThreadSanitizer (race conditions)
 cmake --build build -j$(nproc)
 ```
 
-For UndefinedBehaviorSanitizer (no `-DSANITIZER=undefined` option in CMakeLists.txt yet), use the manual flag approach:
+UndefinedBehaviorSanitizer uses the same built-in option:
 ```bash
-cmake -B build -S . \
-  -DCMAKE_C_FLAGS="-fsanitize=undefined -fno-omit-frame-pointer -g" \
-  -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=undefined"
+cmake -B build -S . -DSANITIZER=undefined
 cmake --build build -j$(nproc)
 ```
 
diff --git a/.opencode/agents/integrator.md b/.opencode/agents/integrator.md
index 567729e..47d9afb 100644
--- a/.opencode/agents/integrator.md
+++ b/.opencode/agents/integrator.md
@@ -21,7 +21,7 @@ Design integration tests that verify the full transfer pipeline works end-to-end
 - Multiple configurations (TCP, SSH, TLS, compression, multithreading)
 - Network shaping (LAN, WAN profiles)
 - Feature tests (dry run, archive, exclude, delete, incremental, bandwidth limit)
-- Run: `python3 -m pytest tests/ -v --tb=short`
+- Run: `python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"`
 
 ### 3. New: Focused Integration Tests
 When adding new features or fixing bugs, write targeted integration tests.
@@ -77,7 +77,7 @@ openssl req -x509 -newkey rsa:2048 -keyout /tmp/key.pem -out /tmp/cert.pem \
 ### Pattern 4: Incremental Sync
 ```bash
 # First sync
-./build/client --source-dir /tmp/src --dest-dir /tmp/dst --save-to-disk -M
+./build/client --source-dir /tmp/src --dest-dir /tmp/dst --save-to-disk
 
 # Modify source
 echo "updated" >> /tmp/src/file.txt
@@ -90,14 +90,14 @@ echo "updated" >> /tmp/src/file.txt
 ### Pattern 5: Delete Verification
 ```bash
 # Initial sync
-./build/client --source-dir /tmp/src --dest-dir /tmp/dst --save-to-disk -M
+./build/client --source-dir /tmp/src --dest-dir /tmp/dst --save-to-disk
 
 # Add extra file to dest
 echo "extra" > /tmp/dst/.../extra.txt
 
 # Sync with --delete
 ./build/client --source-dir /tmp/src --dest-dir /tmp/dst \
-  --save-to-disk --delete -M
+  --save-to-disk --delete
 
 # Verify extra.txt is gone
 test ! -f /tmp/dst/.../extra.txt
@@ -116,7 +116,7 @@ The project uses Gitea Actions. Key jobs:
 jobs:
   new-job:
     runs-on: ubuntu-latest
-    container: gitea.tap-tap.win/taptap/fastsync-ci:v7
+    container: gitea.tap-tap.win/taptap/fastsync-ci:v10
     steps:
       - uses: actions/checkout@v4
       - name: Configure
@@ -128,7 +128,7 @@ jobs:
       - name: Unit Tests
         run: ./build-${{ matrix.sanitizer }}/tests
       - name: Integration Tests
-        run: LSAN_OPTIONS=suppressions=.lsan-suppressions.txt python3 -m pytest tests/ -v --tb=short
+        run: LSAN_OPTIONS=suppressions=.lsan-suppressions.txt python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"
 ```
 The symlink step is required because `tests/conftest.py` expects `./build` to exist.
 
@@ -136,7 +136,7 @@ The symlink step is required because `tests/conftest.py` expects `./build` to ex
 
 After any code change:
 - [ ] Unit tests pass: `./build/tests`
-- [ ] Integration tests pass: `python3 -m pytest tests/ -v --tb=short`
+- [ ] Integration tests pass: `python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"`
 - [ ] Build clean: no warnings with `-Wall`
 - [ ] No memory errors: ASan clean
 - [ ] No thread errors: TSan clean (if threading involved)
diff --git a/.opencode/agents/test-writer.md b/.opencode/agents/test-writer.md
index 9d15d8c..3f24055 100644
--- a/.opencode/agents/test-writer.md
+++ b/.opencode/agents/test-writer.md
@@ -138,11 +138,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
 Build for fuzzing:
 ```bash
-cmake -B build-fuzz -S . \
-  -DCMAKE_C_FLAGS="-fsanitize=fuzzer,address,undefined -g" \
-  -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=fuzzer,address,undefined"
+CC=clang CXX=clang++ cmake -B build-fuzz -S . -DENABLE_FUZZ=ON
 cmake --build build-fuzz -j$(nproc)
-./build-fuzz/tests/fuzz_chunk_deserialize corpus/ -max_len=1048576
+./build-fuzz/fuzz_chunk_deserialize corpus/ -max_len=1048576
 ```
 
 ### AFL++ Harness
diff --git a/.opencode/skills/pr-review/SKILL.md b/.opencode/skills/pr-review/SKILL.md
index 395abc2..99e4fcd 100644
--- a/.opencode/skills/pr-review/SKILL.md
+++ b/.opencode/skills/pr-review/SKILL.md
@@ -125,7 +125,7 @@ STYLE: <count>
 
 If the user wants to post the review as a PR comment:
 ```bash
-tea pr comment <number> --comment "<review report>"
+tea comment --repo TapTap/FastSync <number> "<review report>"
 ```
 
 ## Rules
diff --git a/AGENTS.md b/AGENTS.md
index a41dcc5..abdb967 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -80,7 +80,7 @@ docker run --rm -v "$PWD:/workspace" -w /workspace gitea.tap-tap.win/taptap/fast
 ### If integration tests fail
 Run locally before pushing:
 ```bash
-python3 -m pytest tests/ -v --tb=short
+python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"
 ```
 
 ## Branch Strategy
diff --git a/README.md b/README.md
index 0c3bc9f..ee5627c 100644
--- a/README.md
+++ b/README.md
@@ -314,7 +314,7 @@ ssh user@host 'mkdir -p destination'
 Start the FastSync server:
 
 ```bash
-./build/server --destination-root /path/to -p 8080
+./build/server --destination-root /path/to -p 8080 --allow-unauthenticated
 ```
 
 Then run the client:
@@ -366,7 +366,7 @@ FastSync-native are optional performance or transport extensions.
 ./build/client --incremental --checksum /source/ user@host:destination/
 
 #Preserve supported mode and timestamp metadata
-./build/client -M /source/ user@host:destination/
+./build/client --preserve /source/ user@host:destination/
 
 #Keep backups of overwritten destination files
 ./build/client --backup --backup-dir backups \
@@ -643,7 +643,7 @@ Run the unit test binary:
 Run the Python integration suite:
 
 ```bash
-python3 -m pytest tests/
+python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"
 ```
 
 For stricter local validation: