chore: import upstream snapshot with attribution

.github/ISSUE_TEMPLATE/lesson_correction.yml

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+name: "✍️ Lesson Correction / Typo"
+description: "Suggest corrections to spelling, broken links, or code errors in a lesson notebook"
+title: "[Correction]: "
+labels: ["bug", "documentation"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for helping us improve our lessons! Please fill out the form below.
+  - type: input
+    id: lesson_name
+    attributes:
+      label: "Lesson Name or File Path"
+      description: "Which week, lesson, or notebook file path contains the error?"
+      placeholder: "e.g., lessons/3-NeuralNetworks/03-Perceptron/README.md"
+    validations:
+      required: true
+  - type: textarea
+    id: error_details
+    attributes:
+      label: "Correction Details"
+      description: "Describe what is incorrect and what the correct spelling or code should be."
+      placeholder: "The link to the PyTorch docs in section 3 is broken, it should point to..."
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/translation_feedback.yml

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+name: "🌐 Translation Feedback"
+description: "Suggest improvements or submit translations for a language"
+title: "[Translation]: "
+labels: ["translations"]
+body:
+  - type: dropdown
+    id: language
+    attributes:
+      label: "Target Language"
+      options:
+        - Arabic (ar)
+        - Bengali (bn)
+        - Bulgarian (bg)
+        - Croatian (hr)
+        - Czech (cs)
+        - Danish (da)
+        - Dutch (nl)
+        - Estonian (et)
+        - Finnish (fi)
+        - French (fr)
+        - German (de)
+        - Greek (el)
+        - Hebrew (he)
+        - Hindi (hi)
+        - Hungarian (hu)
+        - Indonesian (id)
+        - Italian (it)
+        - Japanese (ja)
+        - Kannada (kn)
+        - Khmer (km)
+        - Korean (ko)
+        - Lithuanian (lt)
+        - Malay (ms)
+        - Malayalam (ml)
+        - Marathi (mr)
+        - Burmese (my)
+        - Nepali (ne)
+        - Nigerian Pidgin (pcm)
+        - Norwegian (no)
+        - Persian (fa)
+        - Polish (pl)
+        - Portuguese - Brazil (pt-BR)
+        - Portuguese - Portugal (pt-PT)
+        - Punjabi (pa)
+        - Romanian (ro)
+        - Russian (ru)
+        - Serbian (sr)
+        - Slovak (sk)
+        - Slovenian (sl)
+        - Spanish (es)
+        - Swahili (sw)
+        - Swedish (sv)
+        - Tamil (ta)
+        - Telugu (te)
+        - Thai (th)
+        - Tagalog (tl)
+        - Turkish (tr)
+        - Ukrainian (uk)
+        - Urdu (ur)
+        - Vietnamese (vi)
+        - Simplified Chinese (zh-CN)
+        - Traditional Chinese - Hong Kong (zh-HK)
+        - Traditional Chinese - Macao (zh-MO)
+        - Traditional Chinese - Taiwan (zh-TW)
+        - Other (please specify in details)
+    validations:
+      required: true
+  - type: textarea
+    id: details
+    attributes:
+      label: "Details"
+      description: "Specify the translation feedback, grammatical fixes, or new translation files you plan to submit."
+    validations:
+      required: true

.github/workflows/codeql.yml

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+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL Advanced"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '37 17 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    # Runner size impacts CodeQL analysis time. To learn more, please see:
+    #   - https://gh.io/recommended-hardware-resources-for-running-codeql
+    #   - https://gh.io/supported-runners-and-hardware-resources
+    #   - https://gh.io/using-larger-runners (GitHub.com only)
+    # Consider using larger runners or machines with greater resources for possible analysis time improvements.
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+    permissions:
+      # required for all workflows
+      security-events: write
+
+      # required to fetch internal or private CodeQL packs
+      packages: read
+
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: actions
+          build-mode: none
+        - language: javascript-typescript
+          build-mode: none
+        - language: python
+          build-mode: none
+        # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'rust', 'swift'
+        # Use `c-cpp` to analyze code written in C, C++ or both
+        # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
+        # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
+        # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
+        # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
+        # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
+        # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v6
+
+    # Add any setup steps before running the `github/codeql-action/init` action.
+    # This includes steps like installing compilers or runtimes (`actions/setup-node`
+    # or others). This is typically only required for manual builds.
+    # - name: Setup runtime (example)
+    #   uses: actions/setup-example@v1
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+
+        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+        # queries: security-extended,security-and-quality
+
+    # If the analyze step fails for one of the languages you are analyzing with
+    # "We were unable to automatically build your code", modify the matrix above
+    # to set the build mode to "manual" for that language. Then modify this step
+    # to build your code.
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+    - if: matrix.build-mode == 'manual'
+      shell: bash
+      run: |
+        echo 'If you are using a "manual" build mode for one or more of the' \
+          'languages you are analyzing, replace this with the commands to build' \
+          'your code, for example:'
+        echo '  make bootstrap'
+        echo '  make release'
+        exit 1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"

.github/workflows/scorecard.yml

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+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '44 15 * * 5'
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      # Uncomment the permissions below if installing in a private repository.
+      # contents: read
+      # actions: read
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@0864cf19026789058feabb7e87baa5f140aac736 # v2.3.1
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecard on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action?tab=readme-ov-file#authentication-with-fine-grained-pat-optional.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@97a0fba1372883ab732affbe8f94b823f91727db # v3.pre.node20
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard (optional).
+      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@1b1aada464948af03b950897e5eb522f92603cc2 # v3.24.9
+        with:
+          sarif_file: results.sarif