chore: standardize GPL-3.0 licensing

.github/workflows/lint-docs.yml

@@ -35,9 +35,8 @@ jobs:
       - name: Lint Markdown
         uses: DavidAnson/markdownlint-cli2-action@6bf21b07787794f89a243495939cd651942aeabe # v24.1.0
         with:
-          # Changelogs are generated by git-cliff; LICENSE.md preserves canonical licence text.
+          # Changelogs are generated by git-cliff.
           globs: |
             **/*.md
             #CHANGELOG.md
             #CHANGELOG_RELEASE.md
-            #LICENSE.md

README.md

@@ -1,6 +1,6 @@
 # 🎮 chdtool
 
-[![License](https://img.shields.io/github/license/lloydsmart/chdtool)](https://github.com/lloydsmart/chdtool/blob/main/LICENSE.md)
+[![License](https://img.shields.io/github/license/lloydsmart/chdtool)](LICENSE)
 [![Release](https://img.shields.io/github/v/release/lloydsmart/chdtool)](https://github.com/lloydsmart/chdtool/releases)
 [![ShellCheck](https://img.shields.io/github/actions/workflow/status/lloydsmart/chdtool/shellcheck.yml?branch=main&label=shellcheck)](https://github.com/lloydsmart/chdtool/actions/workflows/shellcheck.yml)
 
@@ -251,7 +251,7 @@ result at the available CPU count with a minimum of one.
 ## 📦 Release assets
 
 Each release publishes `.tar.gz` and `.zip` archives containing `chdtool`,
-`README.md`, `LICENSE.md`, and `CHANGELOG.md`, plus a standalone `chdtool`
+`README.md`, `LICENSE`, and `CHANGELOG.md`, plus a standalone `chdtool`
 script. Verify downloads with the published checksum file:
 
 ```bash
@@ -279,3 +279,9 @@ than creating tags or assets manually.
 - Better metadata integration
 - Optional compression tuning
 - Integration with tools like Retromount / ROM managers
+
+---
+
+## License
+
+This project is licensed under the [GNU General Public License v3.0 only](LICENSE).

RELEASING.md

@@ -54,7 +54,7 @@ When `actionlint` and `markdownlint-cli2` are available, also run:
 ```bash
 actionlint
 npx --yes markdownlint-cli2 "**/*.md" "#CHANGELOG.md" \
-  "#CHANGELOG_RELEASE.md" "#LICENSE.md"
+  "#CHANGELOG_RELEASE.md" "#LICENSE"
 ```
 
 Build and validate the release assets locally:
@@ -71,7 +71,7 @@ with these files:
 
 - `chdtool`
 - `README.md`
-- `LICENSE.md`
+- `LICENSE`
 - `CHANGELOG.md`
 
 The `dist/` directory is rebuilt from scratch by the packaging command.

scripts/package-release.sh

@@ -33,7 +33,7 @@ stage_dir="$stage_root/$archive_base"
 mkdir -p "$stage_dir"
 
 install -m 0755 chdtool.sh "$stage_dir/chdtool"
-install -m 0644 README.md LICENSE.md CHANGELOG.md "$stage_dir/"
+install -m 0644 README.md LICENSE CHANGELOG.md "$stage_dir/"
 
 # Use the tagged commit timestamp when available, with a stable fallback for
 # source archives or local packaging outside a Git checkout.
@@ -56,7 +56,7 @@ install -m 0755 chdtool.sh "$dist_dir/chdtool"
 
 expected="$(printf '%s\n' \
   "$archive_base/CHANGELOG.md" \
-  "$archive_base/LICENSE.md" \
+  "$archive_base/LICENSE" \
   "$archive_base/README.md" \
   "$archive_base/chdtool")"
 tar_contents="$(tar -tzf "$dist_dir/$archive_base.tar.gz" | sed '/\/$/d' | LC_ALL=C sort)"