diff --git a/.github/workflows/ci.yml b/.gitea/workflows/ci.yml
similarity index 81%
rename from .github/workflows/ci.yml
rename to .gitea/workflows/ci.yml
index 2038e93..b647ec8 100644
--- a/.github/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -7,7 +7,6 @@ on:
   pull_request:
     branches:
       - main
-  merge_group:
   workflow_dispatch:
 
 permissions:
@@ -32,7 +31,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
           components: rustfmt
-          cache-key: fmt
+          cache: false
 
       - name: Check formatting
         uses: actions-rust-lang/rustfmt@4066006ec54a31931b9b1fddfd38f2fdf2d27143 # v1
@@ -52,7 +51,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
           components: clippy
-          cache-key: clippy
+          cache: false
 
       - name: Run clippy
         run: |
@@ -79,46 +78,22 @@ jobs:
       matrix:
         include:
           - task: check
-            runner: ubuntu-24.04
             target: x86_64-unknown-linux-gnu
             musl: false
 
           - task: test
-            runner: ubuntu-24.04
             target: x86_64-unknown-linux-gnu
             musl: false
 
           - task: check
-            runner: ubuntu-24.04
             target: x86_64-unknown-linux-musl
             musl: true
 
           - task: test
-            runner: ubuntu-24.04
             target: x86_64-unknown-linux-musl
             musl: true
 
-          - task: check
-            runner: ubuntu-24.04-arm
-            target: aarch64-unknown-linux-gnu
-            musl: false
-
-          - task: test
-            runner: ubuntu-24.04-arm
-            target: aarch64-unknown-linux-gnu
-            musl: false
-
-          - task: check
-            runner: ubuntu-24.04-arm
-            target: aarch64-unknown-linux-musl
-            musl: true
-
-          - task: test
-            runner: ubuntu-24.04-arm
-            target: aarch64-unknown-linux-musl
-            musl: true
-
-    runs-on: ${{ matrix.runner }}
+    runs-on: ubuntu-latest
     timeout-minutes: 25
 
     steps:
@@ -137,7 +112,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
           target: ${{ matrix.target }}
-          cache-key: ${{ matrix.task }}-${{ matrix.target }}
+          cache: false
 
       - name: Run ${{ matrix.task }} with all features
         run: |
@@ -174,7 +149,7 @@ jobs:
       - name: Install Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
-          cache-key: docs
+          cache: false
 
       - name: Check docs
         run: |
diff --git a/.github/workflows/fuzz.yml b/.gitea/workflows/fuzz.yml
similarity index 98%
rename from .github/workflows/fuzz.yml
rename to .gitea/workflows/fuzz.yml
index ac6adaa..beb7e9d 100644
--- a/.github/workflows/fuzz.yml
+++ b/.gitea/workflows/fuzz.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Install stable Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
-          cache-key: fuzz
+          cache: false
 
       - name: Install nightly Rust toolchain
         # Installed alongside, but deliberately not made the directory
diff --git a/.github/workflows/interop-netem.yml b/.gitea/workflows/interop-netem.yml
similarity index 87%
rename from .github/workflows/interop-netem.yml
rename to .gitea/workflows/interop-netem.yml
index 283b619..0638dc1 100644
--- a/.github/workflows/interop-netem.yml
+++ b/.gitea/workflows/interop-netem.yml
@@ -32,13 +32,14 @@ jobs:
       - name: Install Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
-          cache-key: interop-netem
+          cache: false
 
-      - name: Check host tools
+      - name: Check host tools and network administration access
         run: |
           ip -V
           tc -V
           go version
+          sudo -n true
 
       - name: Install upstream irtt
         run: |
@@ -62,14 +63,14 @@ jobs:
         run: |
           latest_summary="$(find target/interop-netem -mindepth 2 -maxdepth 2 -name github-step-summary.md -type f -print 2>/dev/null | sort | tail -n 1)"
           if [ -n "$latest_summary" ]; then
-            cat "$latest_summary" >> "$GITHUB_STEP_SUMMARY"
+            cat "$latest_summary" >> "$GITEA_STEP_SUMMARY"
           else
-            echo "No netem interop github-step-summary.md found." >> "$GITHUB_STEP_SUMMARY"
+            echo "No netem interop github-step-summary.md found." >> "$GITEA_STEP_SUMMARY"
           fi
 
       - name: Upload netem interop artifacts
         if: always()
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
+        uses: https://gitea.com/actions/gitea-upload-artifact@v7
         with:
           name: interop-netem
           path: target/interop-netem
diff --git a/.github/workflows/semver.yml b/.gitea/workflows/semver.yml
similarity index 50%
rename from .github/workflows/semver.yml
rename to .gitea/workflows/semver.yml
index f4f9acd..b254653 100644
--- a/.github/workflows/semver.yml
+++ b/.gitea/workflows/semver.yml
@@ -25,7 +25,16 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Check semver compatibility
-        uses: obi1kenobi/cargo-semver-checks-action@6b69fcf40e9b5fb17adeb57e4b6ecd020649a239 # v2
+      - name: Install Rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
         with:
-          feature-group: all-features
+          cache: false
+
+      # The action wrapper downloads through the GitHub API and uses the
+      # GitHub cache service. The underlying CLI is portable and preserves
+      # the existing wrapper's `feature-group: all-features` behavior.
+      - name: Install cargo-semver-checks
+        run: cargo install cargo-semver-checks --locked
+
+      - name: Check semver compatibility
+        run: cargo semver-checks check-release --all-features
diff --git a/.github/workflows/supply-chain.yml b/.gitea/workflows/supply-chain.yml
similarity index 62%
rename from .github/workflows/supply-chain.yml
rename to .gitea/workflows/supply-chain.yml
index 644ad47..e44a8ed 100644
--- a/.github/workflows/supply-chain.yml
+++ b/.gitea/workflows/supply-chain.yml
@@ -7,7 +7,6 @@ on:
   pull_request:
     branches:
       - main
-  merge_group:
   schedule:
     - cron: "41 2 * * 1"
   workflow_dispatch:
@@ -15,6 +14,9 @@ on:
 permissions:
   contents: read
 
+env:
+  ACTIONLINT_VERSION: 1.7.7
+
 jobs:
   cargo-deny:
     name: cargo-deny ${{ matrix.checks }}
@@ -60,20 +62,26 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install actionlint
+        run: go install github.com/rhysd/actionlint/cmd/actionlint@v${ACTIONLINT_VERSION}
+
       - name: actionlint handwritten workflows
-        uses: raven-actions/actionlint@205b530c5d9fa8f44ae9ed59f341a0db994aa6f8
-        with:
-          files: >-
-            .github/workflows/actions-security.yml,
-            .github/workflows/ci.yml,
-            .github/workflows/interop-netem.yml,
-            .github/workflows/osv-scanner.yml,
-            .github/workflows/rust-clippy.yml,
-            .github/workflows/semver.yml,
-            .github/workflows/supply-chain.yml
+        # actionlint validates GitHub Actions syntax. It cannot parse Gitea's
+        # required absolute action URL in interop-netem.yml, so that workflow
+        # is checked by the Gitea runner instead.
+        run: |
+          "$(go env GOPATH)/bin/actionlint" \
+            .gitea/workflows/ci.yml \
+            .gitea/workflows/docker-publish.yml \
+            .gitea/workflows/fuzz.yml \
+            .gitea/workflows/semver.yml \
+            .gitea/workflows/supply-chain.yml \
+            .github/workflows/actions-security.yml \
+            .github/workflows/ci-arm.yml \
+            .github/workflows/osv-scanner.yml \
+            .github/workflows/rust-clippy.yml
 
       - name: actionlint generated release workflow
-        uses: raven-actions/actionlint@205b530c5d9fa8f44ae9ed59f341a0db994aa6f8
-        with:
-          files: .github/workflows/irtt-rs-release.yml
-          shellcheck: false
+        run: >-
+          "$(go env GOPATH)/bin/actionlint" -shellcheck=
+          .github/workflows/irtt-rs-release.yml
diff --git a/.github/workflows/actions-security.yml b/.github/workflows/actions-security.yml
index b3351c6..5fe17d6 100644
--- a/.github/workflows/actions-security.yml
+++ b/.github/workflows/actions-security.yml
@@ -16,34 +16,6 @@ permissions:
   contents: read
 
 jobs:
-  actionlint:
-    name: actionlint
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-        with:
-          persist-credentials: false
-
-      - name: actionlint handwritten workflows
-        uses: raven-actions/actionlint@205b530c5d9fa8f44ae9ed59f341a0db994aa6f8
-        with:
-          files: >-
-            .github/workflows/actions-security.yml,
-            .github/workflows/ci.yml,
-            .github/workflows/interop-netem.yml,
-            .github/workflows/osv-scanner.yml,
-            .github/workflows/rust-clippy.yml,
-            .github/workflows/semver.yml,
-            .github/workflows/supply-chain.yml
-
-      - name: actionlint generated release workflow
-        uses: raven-actions/actionlint@205b530c5d9fa8f44ae9ed59f341a0db994aa6f8
-        with:
-          files: .github/workflows/irtt-rs-release.yml
-          shellcheck: false
   zizmor:
     name: zizmor
     runs-on: ubuntu-latest
@@ -60,7 +32,13 @@ jobs:
         with:
           persist-credentials: false
 
+      # Zizmor's SARIF integration publishes GitHub Code Scanning results.
+      # It remains here while portable actionlint runs with Gitea CI, but scans
+      # both workflow directories through its GitHub Actions rule set.
       - name: Run zizmor
         uses: zizmorcore/zizmor-action@70fb788f84895a7701f5643d103d587e460b5c99 # v0.6.3
         with:
           persona: regular
+          inputs: |
+            .github/workflows
+            .gitea/workflows
diff --git a/.github/workflows/ci-arm.yml b/.github/workflows/ci-arm.yml
new file mode 100644
index 0000000..054fc6a
--- /dev/null
+++ b/.github/workflows/ci-arm.yml
@@ -0,0 +1,80 @@
+name: Rust ARM CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  merge_group:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  verify:
+    name: cargo ${{ matrix.task }} (${{ matrix.target }})
+    # Gitea currently has only amd64 Linux runners; retain ARM coverage here.
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - task: check
+            target: aarch64-unknown-linux-gnu
+            musl: false
+
+          - task: test
+            target: aarch64-unknown-linux-gnu
+            musl: false
+
+          - task: check
+            target: aarch64-unknown-linux-musl
+            musl: true
+
+          - task: test
+            target: aarch64-unknown-linux-musl
+            musl: true
+
+    runs-on: ubuntu-24.04-arm
+    timeout-minutes: 25
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+
+      - name: Install musl toolchain
+        if: matrix.musl
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends musl-tools
+
+      - name: Install Rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@166cdcfd11aee3cb47222f9ddb555ce30ddb9659 # v1
+        with:
+          target: ${{ matrix.target }}
+          cache-key: ${{ matrix.task }}-${{ matrix.target }}
+
+      - name: Run ${{ matrix.task }} with all features
+        run: |
+          cargo ${{ matrix.task }} \
+            --workspace \
+            --all-targets \
+            --all-features \
+            --target ${{ matrix.target }} \
+            --locked
+
+      - name: Run ${{ matrix.task }} without default features
+        run: |
+          cargo ${{ matrix.task }} \
+            --workspace \
+            --all-targets \
+            --no-default-features \
+            --target ${{ matrix.target }} \
+            --locked
diff --git a/docs/INTEROP_COMPARISON.md b/docs/INTEROP_COMPARISON.md
index 0b32213..0150f48 100644
--- a/docs/INTEROP_COMPARISON.md
+++ b/docs/INTEROP_COMPARISON.md
@@ -139,5 +139,5 @@ scenario contains the existing comparison harness output under
 `netem-summary.json` files. Server stdout/stderr are captured at the run root as
 `server.stdout` and `server.stderr`.
 
-On macOS, `ip netns` and `tc netem` are unavailable; use the GitHub Actions
+On macOS, `ip netns` and `tc netem` are unavailable; use the Gitea Actions
 workflow for netem coverage.