diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 80dc2f6b1..11f041aff 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -44,22 +44,6 @@ on:
       - "**/*.svg"
       - ".gitignore"
       - ".dockerignore"
-  pull_request:
-    branches: [ main ]
-    paths-ignore:
-      - "**.md"
-      - "**.txt"
-      - ".github/**"
-      - "docs/**"
-      - "deploy/**"
-      - "scripts/dev_*.sh"
-      - "LICENSE*"
-      - "README*"
-      - "**/*.png"
-      - "**/*.jpg"
-      - "**/*.svg"
-      - ".gitignore"
-      - ".dockerignore"
   schedule:
     - cron: "0 0 * * 0" # Weekly on Sunday at midnight UTC
   workflow_dispatch:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9c3ae8128..9aa65ffb1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -91,6 +91,8 @@ jobs:
 
   typos:
     name: Typos
+    needs: skip-check
+    if: needs.skip-check.outputs.should_skip != 'true'
     runs-on: ubicloud-standard-2
     steps:
       - uses: actions/checkout@v6
@@ -116,9 +118,6 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache-save-if: ${{ github.ref == 'refs/heads/main' }}
 
-      - name: Install cargo-nextest
-        uses: taiki-e/install-action@nextest
-
       - name: Run tests
         run: |
           cargo nextest run --all --exclude e2e_test
@@ -133,9 +132,40 @@ jobs:
       - name: Check layered dependencies
         run: ./scripts/check_layer_dependencies.sh
 
+  build-rustfs-debug-binary:
+    name: Build RustFS Debug Binary
+    needs: skip-check
+    if: needs.skip-check.outputs.should_skip != 'true'
+    runs-on: ubicloud-standard-4
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Rust environment
+        uses: ./.github/actions/setup
+        with:
+          rust-version: stable
+          cache-shared-key: ci-rustfs-debug-binary-${{ hashFiles('**/Cargo.lock') }}
+          cache-save-if: ${{ github.ref == 'refs/heads/main' }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build debug binary
+        run: |
+          touch rustfs/build.rs
+          cargo build -p rustfs --bins --jobs 2
+
+      - name: Upload debug binary
+        uses: actions/upload-artifact@v6
+        with:
+          name: rustfs-debug-binary
+          path: target/debug/rustfs
+          if-no-files-found: error
+          retention-days: 1
+
   e2e-tests:
     name: End-to-End Tests
-    needs: skip-check
+    needs: [ skip-check, build-rustfs-debug-binary ]
     if: needs.skip-check.outputs.should_skip != 'true'
     runs-on: ubicloud-standard-2
     timeout-minutes: 30
@@ -148,13 +178,17 @@ jobs:
           rm -rf /tmp/rustfs
           rm -f /tmp/rustfs.log
 
-      - name: Setup Rust environment
-        uses: ./.github/actions/setup
+      - name: Download debug binary
+        uses: actions/download-artifact@v7
         with:
-          rust-version: stable
-          cache-shared-key: ci-e2e-${{ hashFiles('**/Cargo.lock') }}
-          cache-save-if: ${{ github.ref == 'refs/heads/main' }}
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          name: rustfs-debug-binary
+          path: target/debug
+
+      - name: Make binary executable
+        run: chmod +x ./target/debug/rustfs
+
+      - name: Setup Rust toolchain for s3s-e2e installation
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install s3s-e2e test tool
         uses: taiki-e/cache-cargo-install-action@v2
@@ -163,12 +197,6 @@ jobs:
           git: https://github.com/s3s-project/s3s.git
           rev: 4a04a670cf41274d9be9ab65dc36f4aa3f92fbad
 
-      - name: Build debug binary
-        run: |
-          touch rustfs/build.rs
-          # Limit concurrency to prevent OOM
-          cargo build -p rustfs --bins --jobs 2
-
       - name: Run end-to-end tests
         run: |
           s3s-e2e --version
@@ -184,7 +212,7 @@ jobs:
 
   s3-implemented-tests:
     name: S3 Implemented Tests
-    needs: skip-check
+    needs: [ skip-check, build-rustfs-debug-binary ]
     if: needs.skip-check.outputs.should_skip != 'true'
     runs-on: ubicloud-standard-4
     timeout-minutes: 60
@@ -192,18 +220,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
 
-      - name: Setup Rust environment
-        uses: ./.github/actions/setup
+      - name: Download debug binary
+        uses: actions/download-artifact@v7
         with:
-          rust-version: stable
-          cache-shared-key: ci-s3tests-${{ hashFiles('**/Cargo.lock') }}
-          cache-save-if: ${{ github.ref == 'refs/heads/main' }}
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          name: rustfs-debug-binary
+          path: target/debug
 
-      - name: Build debug binary
-        run: |
-          touch rustfs/build.rs
-          cargo build -p rustfs --bins --jobs 2
+      - name: Make binary executable
+        run: chmod +x ./target/debug/rustfs
 
       - name: Run implemented s3-tests
         run: |
diff --git a/.github/workflows/e2e-s3tests.yml b/.github/workflows/e2e-s3tests.yml
index 513278536..a2a8829ae 100644
--- a/.github/workflows/e2e-s3tests.yml
+++ b/.github/workflows/e2e-s3tests.yml
@@ -50,6 +50,11 @@ env:
 
   RUST_LOG: info
   PLATFORM: linux/amd64
+  BUILDX_CACHE_SCOPE: rustfs-e2e-s3tests-source
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event.inputs['test-mode'] || 'single' }}
+  cancel-in-progress: true
 
 defaults:
   run:
@@ -57,12 +62,25 @@ defaults:
 
 jobs:
   s3tests-single:
-    if: github.event.inputs.test-mode == 'single'
+    if: github.event.inputs['test-mode'] == 'single'
     runs-on: ubicloud-standard-2
     timeout-minutes: 120
     steps:
       - uses: actions/checkout@v6
 
+      - name: Cache pip downloads
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-e2e-s3tests-${{ hashFiles('.github/workflows/e2e-s3tests.yml') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-e2e-s3tests-
+
+      - name: Install Python tools
+        run: |
+          python3 -m pip install --user --upgrade pip awscurl tox
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
       - name: Enable buildx
         uses: docker/setup-buildx-action@v3
 
@@ -70,8 +88,8 @@ jobs:
         run: |
           DOCKER_BUILDKIT=1 docker buildx build --load \
             --platform ${PLATFORM} \
-            --cache-from type=gha \
-            --cache-to type=gha,mode=max \
+            --cache-from type=gha,scope=${BUILDX_CACHE_SCOPE} \
+            --cache-to type=gha,mode=max,scope=${BUILDX_CACHE_SCOPE} \
             -t rustfs-ci \
             -f Dockerfile.source .
 
@@ -121,9 +139,6 @@ jobs:
 
       - name: Provision s3-tests alt user (required by suite)
         run: |
-          python3 -m pip install --user --upgrade pip awscurl
-          export PATH="$HOME/.local/bin:$PATH"
-
           # Admin API requires AWS SigV4 signing. awscurl is used by RustFS codebase as well.
           awscurl \
             --service s3 \
@@ -156,8 +171,6 @@ jobs:
 
       - name: Prepare s3-tests
         run: |
-          python3 -m pip install --user --upgrade pip tox
-          export PATH="$HOME/.local/bin:$PATH"
           git clone --depth 1 https://github.com/ceph/s3-tests.git s3-tests
 
       - name: Run ceph s3-tests (debug friendly)
@@ -211,12 +224,25 @@ jobs:
           path: artifacts/**
 
   s3tests-multi:
-    if: github.event_name == 'workflow_dispatch' && github.event.inputs.test-mode == 'multi'
+    if: github.event_name == 'workflow_dispatch' && github.event.inputs['test-mode'] == 'multi'
     runs-on: ubicloud-standard-2
     timeout-minutes: 150
     steps:
       - uses: actions/checkout@v6
 
+      - name: Cache pip downloads
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-e2e-s3tests-${{ hashFiles('.github/workflows/e2e-s3tests.yml') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-e2e-s3tests-
+
+      - name: Install Python tools
+        run: |
+          python3 -m pip install --user --upgrade pip awscurl tox
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
       - name: Enable buildx
         uses: docker/setup-buildx-action@v3
 
@@ -224,8 +250,8 @@ jobs:
         run: |
           DOCKER_BUILDKIT=1 docker buildx build --load \
             --platform ${PLATFORM} \
-            --cache-from type=gha \
-            --cache-to type=gha,mode=max \
+            --cache-from type=gha,scope=${BUILDX_CACHE_SCOPE} \
+            --cache-to type=gha,mode=max,scope=${BUILDX_CACHE_SCOPE} \
             -t rustfs-ci \
             -f Dockerfile.source .
 
@@ -337,9 +363,6 @@ jobs:
 
       - name: Provision s3-tests alt user (required by suite)
         run: |
-          python3 -m pip install --user --upgrade pip awscurl
-          export PATH="$HOME/.local/bin:$PATH"
-
           awscurl \
             --service s3 \
             --region "${S3_REGION}" \
@@ -368,8 +391,6 @@ jobs:
 
       - name: Prepare s3-tests
         run: |
-          python3 -m pip install --user --upgrade pip tox
-          export PATH="$HOME/.local/bin:$PATH"
           git clone --depth 1 https://github.com/ceph/s3-tests.git s3-tests
 
       - name: Run ceph s3-tests (multi, debug friendly)
diff --git a/AGENTS.md b/AGENTS.md
index 45ba1d6bb..58a53f2b9 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -87,6 +87,14 @@ Work on feature branches (e.g., `feat/...`) after syncing `main`. Follow Convent
 - Follow the PR template format and fill in all required sections
 - Wait for reviewer approval before merging
 
+### PR Template Enforcement (MANDATORY)
+
+- Always use `.github/pull_request_template.md` when creating or updating a PR body.
+- Keep all template section headings in the final PR description (do not replace with custom sections only).
+- If a section is not applicable, explicitly write `N/A` instead of removing the section.
+- Before requesting review, verify the PR body still contains all template sections.
+- If a PR is created without the template, immediately update the PR body to match the template before any further action.
+
 ## Security & Configuration Tips
 
 Do not commit secrets or cloud credentials; prefer environment variables or vault tooling. Review IAM- and KMS-related changes with a second maintainer. Confirm proxy settings before running sensitive tests to avoid leaking traffic outside localhost.