refactor(root): move root artefacts to their canonical locations

.github/CONTRIBUTING.md

@@ -0,0 +1,71 @@
+# Contributing
+
+Thank you for your interest in contributing! We follow a “Dual-Track”
+architecture where human-readable documentation lives in the root and
+machine-readable policies live in `.machine_readable/`.
+
+## How to Contribute
+
+We welcome contributions in many forms:
+
+- **Code:** Improving the core stack or extensions
+
+- **Documentation:** Enhancing docs or AI manifests
+
+- **Testing:** Adding property-based tests or formal proofs
+
+- **Bug reports:** Filing clear, reproducible issues
+
+## Getting Started
+
+1.  **Read the AI Manifest:** Start with `0-AI-MANIFEST.a2ml` (if
+    present) to understand the repository structure.
+
+2.  **Environment:** Use `nix` `develop` or `direnv` `allow` to set up
+    your tools.
+
+3.  **Task Runner:** Use `just` to see available commands (`just`
+    `--list`).
+
+## Development Workflow
+
+### Branch Naming
+
+    docs/short-description       # Documentation
+    test/what-added              # Test additions
+    feat/short-description       # New features
+    fix/issue-number-description # Bug fixes
+    refactor/what-changed        # Code improvements
+    security/what-fixed          # Security fixes
+
+### Commit Messages
+
+We follow [Conventional Commits](https://www.conventionalcommits.org/):
+
+    <type>(<scope>): <description>
+
+    [optional body]
+
+    [optional footer]
+
+Types: `feat`, `fix`, `docs`, `test`, `refactor`, `ci`, `chore`,
+`security`
+
+## Reporting Bugs
+
+Before reporting: 1. Search existing issues 2. Check if it’s already
+fixed in `main`
+
+When reporting, include: - Clear, descriptive title - Environment
+details (OS, versions, toolchain) - Steps to reproduce - Expected vs
+actual behaviour
+
+## Code of Conduct
+
+All contributors are expected to adhere to our [Code of
+Conduct](CODE_OF_CONDUCT.md).
+
+## License
+
+By contributing, you agree that your contributions will be licensed
+under the same license as the project (see LICENSE).

.github/workflows/dogfood-gate.yml

@@ -34,7 +34,7 @@ jobs:
           fi
       - name: Validate A2ML manifests
         if: steps.detect.outputs.count > 0
-        run: bash .githooks/validate-a2ml.sh
+        run: bash .github/hooks/validate-a2ml.sh
       - name: Write summary
         run: |
           A2ML_COUNT="${{ steps.detect.outputs.count }}"
@@ -75,7 +75,7 @@ jobs:
           fi
       - name: Validate K9 contracts
         if: steps.detect.outputs.k9_count > 0
-        run: bash .githooks/validate-k9.sh
+        run: bash .github/hooks/validate-k9.sh
       - name: Write summary
         run: |
           K9_COUNT="${{ steps.detect.outputs.k9_count }}"

QUICKSTART-MAINTAINER.adoc

@@ -32,7 +32,7 @@ Output: `{{BUILD_OUTPUT_PATH}}`
 
 [source,bash]
 ----
-guix build -f guix.scm
+guix build -f build/guix.scm
 ----
 
 === Nix

docs/accessibility/README.adoc

@@ -244,7 +244,7 @@ Burble is committed to:
 * Supporting screen readers and other assistive technologies
 * Continuous improvement based on user feedback
 
-We welcome contributions to improve accessibility. See our link:../CONTRIBUTING.adoc[Contributing Guide] for details.
+We welcome contributions to improve accessibility. See our link:../../.github/CONTRIBUTING.md[Contributing Guide] for details.
 
 == Related Documents
 

tests/validate-documentation.sh

@@ -33,7 +33,7 @@ done
 
 # Test 4: Required documentation files
 echo "✓ Checking required documentation files..."
-REQUIRED_DOCS=("README.adoc" "CHANGELOG.adoc" "ROADMAP.adoc" "CONTRIBUTING.adoc"
+REQUIRED_DOCS=("README.adoc" "CHANGELOG.adoc" "ROADMAP.adoc" "../.github/CONTRIBUTING.md"
                "CODE_OF_CONDUCT.md" "SECURITY.md" "LICENSE")
 for doc in "${REQUIRED_DOCS[@]}"; do
     if [ ! -f "$doc" ]; then