fix: complete required files list and add missing override (#14)

## Summary

- Add 4 missing files to `required_files` in baseline.json that the
global CLAUDE.md requires on every repo: `CLAUDE.md`,
`.coderabbit.yaml`,
  `.github/copilot-instructions.md`, `.github/PULL_REQUEST_TEMPLATE.md`
- Add `cloud-architecture-course` status check contexts to
overrides.json
  (was the only managed repo without an override)
- Update README and quality-checks to match

## Test plan

- [ ] Verify quality-checks structure validation passes
- [ ] Run dry-run sync to confirm new files are checked across repos
- [ ] Confirm cloud-architecture-course override matches its actual
checks

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Expanded repository structure validation requirements to include
additional configuration files.
  * Updated documentation to reflect new required repository files.
* Added branch protection configuration for an additional repository,
including required status checks for code quality and validation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: gamaware

.github/workflows/quality-checks.yml

@@ -62,8 +62,9 @@ jobs:
           MISSING=0
           for file in LICENSE README.md .gitignore CODEOWNERS CONTRIBUTING.md \
                       SECURITY.md CLAUDE.md .pre-commit-config.yaml \
-                      .github/dependabot.yml config/baseline.json \
-                      config/overrides.json; do
+                      .coderabbit.yaml .github/copilot-instructions.md \
+                      .github/dependabot.yml .github/PULL_REQUEST_TEMPLATE.md \
+                      config/baseline.json config/overrides.json; do
             if [ ! -f "$file" ]; then
               echo "MISSING: $file"
               MISSING=$((MISSING + 1))

README.md

@@ -137,8 +137,12 @@ report (not auto-created, since content is repo-specific).
 | `CODEOWNERS` | Assign default reviewers |
 | `CONTRIBUTING.md` | Contribution guidelines |
 | `SECURITY.md` | Vulnerability disclosure policy |
+| `CLAUDE.md` | Claude Code project instructions |
 | `.pre-commit-config.yaml` | Local linting and validation |
+| `.coderabbit.yaml` | CodeRabbit auto-review configuration |
+| `.github/copilot-instructions.md` | Copilot code review instructions |
 | `.github/dependabot.yml` | Automated dependency updates |
+| `.github/PULL_REQUEST_TEMPLATE.md` | PR checklist template |
 
 ### Metadata Checks (Advisory)
 

config/baseline.json

@@ -97,7 +97,11 @@
     "CODEOWNERS",
     "CONTRIBUTING.md",
     "SECURITY.md",
+    "CLAUDE.md",
     ".pre-commit-config.yaml",
-    ".github/dependabot.yml"
+    ".coderabbit.yaml",
+    ".github/copilot-instructions.md",
+    ".github/dependabot.yml",
+    ".github/PULL_REQUEST_TEMPLATE.md"
   ]
 }

config/overrides.json

@@ -26,6 +26,18 @@
         }
       }
     },
+    "cloud-architecture-course": {
+      "branch_protection": {
+        "required_status_checks": {
+          "contexts": [
+            "Markdown Linting",
+            "YAML Validation",
+            "Validate Repository Structure",
+            "Security Scan"
+          ]
+        }
+      }
+    },
     "aws-organization-governance": {
       "branch_protection": {
         "required_status_checks": {