chore: batch RSR compliance — SPDX headers, SHA-pin actions, forbid(unsafe_code), CODE_OF_CONDUCT, CONTRIBUTING

- Add/fix SPDX-License-Identifier headers (AGPL→PMPL where needed)
- SHA-pin all GitHub Actions to commit hashes
- Add #![forbid(unsafe_code)] to safe Rust crates
- Add CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
- Add CONTRIBUTING.md (standard template)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/ci.yml

@@ -88,14 +88,14 @@ jobs:
 
       - name: Setup Python
         if: needs.detect.outputs.has_python == 'true'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: '3.12'
           cache: 'pip'
 
       - name: Setup Go
         if: needs.detect.outputs.has_go == 'true'
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
         with:
           go-version: '1.22'
           cache: true
@@ -142,14 +142,14 @@ jobs:
 
       - name: Setup Python
         if: needs.detect.outputs.has_python == 'true'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'pip'
 
       - name: Setup Go
         if: needs.detect.outputs.has_go == 'true'
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
         with:
           go-version: ${{ matrix.go-version }}
           cache: true
@@ -182,7 +182,7 @@ jobs:
 
       - name: Upload coverage
         if: success() && github.event_name == 'push'
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
@@ -206,13 +206,13 @@ jobs:
 
       - name: Setup Python
         if: needs.detect.outputs.has_python == 'true'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: '3.12'
 
       - name: Setup Go
         if: needs.detect.outputs.has_go == 'true'
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
         with:
           go-version: '1.22'
 
@@ -278,19 +278,19 @@ jobs:
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
 
       - name: Login to GitHub Container Registry
         if: github.event_name == 'push'
-        uses: docker/login-action@v3
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 # v5
         with:
           images: ghcr.io/${{ github.repository }}
           tags: |
@@ -301,7 +301,7 @@ jobs:
             type=sha
 
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
           push: ${{ github.event_name == 'push' }}
@@ -329,7 +329,7 @@ jobs:
           path: dist/
 
       - name: Create Release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # v1
         with:
           generate_release_notes: true
           files: dist/*

.github/workflows/codeql.yml

@@ -120,26 +120,26 @@ jobs:
 
       - name: Setup Python
         if: matrix.language == 'python'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: '3.12'
 
       - name: Setup Go
         if: matrix.language == 'go'
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
         with:
           go-version: '1.22'
 
       - name: Setup Java
         if: matrix.language == 'java-kotlin'
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           distribution: 'temurin'
           java-version: '21'
 
       - name: Setup .NET
         if: matrix.language == 'csharp'
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: '8.0.x'