build(rust): vendor rnix parser crate

third_party/crates/rnix-0.14.0/.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+---
+
+<!--
+Feel free to remove paragraphs that don't apply to your bugreport.
+-->
+
+### Describe the bug
+
+<!-- A clear and concise description of what the bug is.-->
+
+### Code Snippet to reproduce
+
+<!--
+If applicable, a Nix expression that demonstrates the problem.
+-->
+
+```nix
+
+```
+
+### Expected behavior
+
+<!-- A clear and concise description of what you expected to happen.-->
+
+### Additional context
+
+<!--
+Anything else you consider relevant such as `rnix` version (mandatory), related issues etc.
+-->
+

third_party/crates/rnix-0.14.0/.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+<!--
+Feel free to remove paragraphs that don't apply to your request.
+-->
+
+### Description
+
+<!--
+Describe the feature / a possible solution you'd like to see.
+-->
+
+### Considered alternatives
+
+<!--
+A clear and concise description of any alternative solutions or features you've considered.
+-->
+
+### Additional context
+
+<!--
+Add any context such as screenshots, related issues or whatever you consider relevant here.
+-->

third_party/crates/rnix-0.14.0/.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a general question about the project
+title: ''
+labels: 'question'
+assignees: ''
+---

third_party/crates/rnix-0.14.0/.github/PULL_REQUEST_TEMPLATE.md

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+
+<!--
+Feel free to remove paragraphs that don't apply to your PR.
+-->
+
+### Summary & Motivation
+
+<!--
+Please summarize the changes you've made and the motivation behind it.
+-->
+
+### Backwards-incompatible changes
+
+<!--
+If applicable, please summarize which changes of your PR are backwards-incompatible
+to the latest release.
+-->
+
+### Further context
+
+<!--
+If applicable, please give further context such as related issues / PRs,
+an explanation of the problem you're aiming to solve or anything else you also
+consider relevant.
+-->

third_party/crates/rnix-0.14.0/.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

third_party/crates/rnix-0.14.0/.github/workflows/ci.yml

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+name: ci
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: test
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Compile
+        run: cargo test --no-run --locked
+
+      - name: Test
+        run: cargo test -- --nocapture
+
+  rustfmt:
+    name: rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy:
+    name: clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Run Clippy
+        run: cargo clippy