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

.github/CONTRIBUTING.md

@@ -0,0 +1,103 @@
+# Clone the repository
+
+git clone <https://github.com/hyperpolymath/squisher-corpus.git> cd
+squisher-corpus
+
+# Using Nix (recommended for reproducibility)
+
+nix develop
+
+# Or using toolbox/distrobox
+
+toolbox create squisher-corpus-dev toolbox enter squisher-corpus-dev \#
+Install dependencies manually
+
+# Verify setup
+
+just check \# or: cargo check / mix compile / etc. just test \# Run test
+suite
+
+
+    ### Repository Structure
+
+squisher-corpus/ ├── src/ \# Source code (Perimeter 1-2) ├── lib/ \#
+Library code (Perimeter 1-2) ├── extensions/ \# Extensions (Perimeter 2)
+├── plugins/ \# Plugins (Perimeter 2) ├── tools/ \# Tooling (Perimeter
+2) ├── docs/ \# Documentation (Perimeter 3) │ ├── architecture/ \# ADRs,
+specs (Perimeter 2) │ └── proposals/ \# RFCs (Perimeter 3) ├── examples/
+\# Examples (Perimeter 3) ├── spec/ \# Spec tests (Perimeter 3) ├──
+tests/ \# Test suite (Perimeter 2-3) ├── .well-known/ \# Protocol files
+(Perimeter 1-3) ├── .github/ \# GitHub config (Perimeter 1) │ ├──
+ISSUE_TEMPLATE/ │ └── workflows/ ├── CHANGELOG.md ├── CODE_OF_CONDUCT.md
+├── CONTRIBUTING.md \# This file ├── GOVERNANCE.md ├── LICENSE ├──
+MAINTAINERS.md ├── README.adoc ├── SECURITY.md ├── flake.nix \# Nix
+flake (Perimeter 1) └── Justfile \# Task runner (Perimeter 1)
+
+
+    ---
+
+    ## How to Contribute
+
+    ### Reporting Bugs
+
+    **Before reporting**:
+    1. Search existing issues
+    2. Check if it's already fixed in `main`
+    3. Determine which perimeter the bug affects
+
+    **When reporting**:
+
+    Use the [bug report template](.github/ISSUE_TEMPLATE/bug_report.md) and include:
+
+    - Clear, descriptive title
+    - Environment details (OS, versions, toolchain)
+    - Steps to reproduce
+    - Expected vs actual behaviour
+    - Logs, screenshots, or minimal reproduction
+
+    ### Suggesting Features
+
+    **Before suggesting**:
+    1. Check the [roadmap](ROADMAP.md) if available
+    2. Search existing issues and discussions
+    3. Consider which perimeter the feature belongs to
+
+    **When suggesting**:
+
+    Use the [feature request template](.github/ISSUE_TEMPLATE/feature_request.md) and include:
+
+    - Problem statement (what pain point does this solve?)
+    - Proposed solution
+    - Alternatives considered
+    - Which perimeter this affects
+
+    ### Your First Contribution
+
+    Look for issues labelled:
+
+    - [`good first issue`](https://github.com/hyperpolymath/squisher-corpus/labels/good%20first%20issue) — Simple Perimeter 3 tasks
+    - [`help wanted`](https://github.com/hyperpolymath/squisher-corpus/labels/help%20wanted) — Community help needed
+    - [`documentation`](https://github.com/hyperpolymath/squisher-corpus/labels/documentation) — Docs improvements
+    - [`perimeter-3`](https://github.com/hyperpolymath/squisher-corpus/labels/perimeter-3) — Community sandbox scope
+
+    ---
+
+    ## Development Workflow
+
+    ### Branch Naming
+
+docs/short-description \# Documentation (P3) test/what-added \# Test
+additions (P3) feat/short-description \# New features (P2)
+fix/issue-number-description \# Bug fixes (P2) refactor/what-changed \#
+Code improvements (P2) security/what-fixed \# Security fixes (P1-2)
+
+
+    ### Commit Messages
+
+    We follow [Conventional Commits](https://www.conventionalcommits.org/):
+
+():
+
+\[optional body\]
+
+\[optional footer\]

.gitlab-ci.yml

@@ -33,7 +33,7 @@ validate:docs:
     - |
       echo "Checking RSR documentation requirements..."
       for file in README.adoc LICENSE.txt SECURITY.md CODE_OF_CONDUCT.adoc \
-                  CONTRIBUTING.adoc FUNDING.yml GOVERNANCE.adoc MAINTAINERS.md \
+                  .github/CONTRIBUTING.md FUNDING.yml GOVERNANCE.adoc MAINTAINERS.md \
                   .gitignore .gitattributes; do
         if [ -f "$file" ]; then
           echo "✓ $file"

MAINTAINERS.adoc

@@ -35,7 +35,7 @@ Former maintainers who have stepped down but retain honorary status.
 
 === Becoming a Maintainer
 
-See CONTRIBUTING.adoc for the Tri-Perimeter Contribution Framework.
+See .github/CONTRIBUTING.md for the Tri-Perimeter Contribution Framework.
 
 See GOVERNANCE.adoc for the maintainer selection process.
 

REVERSIBILITY.adoc

@@ -213,4 +213,4 @@ fn test_policy_change_reversible() {
 
 * SECURITY.md - Security implications of reversibility
 * link:docs/ARCHITECTURE.md[ARCHITECTURE.md] - Technical implementation
-* CONTRIBUTING.adoc - How to contribute reversibility tests
+* .github/CONTRIBUTING.md - How to contribute reversibility tests

RSR_COMPLIANCE.adoc

@@ -68,5 +68,5 @@ None
 == References
 
 * link:https://github.com/hyperpolymath/RSR-template-repo[RSR Template Repository]
-* link:../CONTRIBUTING.adoc[Contributing Guidelines]
+* link:.github/CONTRIBUTING.md[Contributing Guidelines]
 * link:../CODE_OF_CONDUCT.adoc[Code of Conduct]