license: relicense source headers to GPL-3.0-or-later (#14)

Change every SPDX-License-Identifier from GPL-3.0-only to
GPL-3.0-or-later (31 files: source, build scripts, train_test_dict.py)
plus the two documentation references (AGENTS.md, CONTRIBUTING.md).

This aligns kzstd with the Meshtastic org license standard: first-party
repos use GPL-3.0-or-later, matching the FSF stock notice the flagship
repos ship and the meshtastic-sdk ADR-004 decision. As the copyright
holder, Meshtastic can broaden the grant from -only to -or-later; the
LICENSE file (stock GPLv3 text) is unchanged.

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

Author: jamesarich

AGENTS.md

@@ -78,6 +78,6 @@ fallback (`com.github.meshtastic:kzstd`). Releases are tag-driven — see
 
 - Commits are **signed off** (DCO): `git commit -s`. The repo owner prefers to be
   the commit author — do **not** add `Co-Authored-By` trailers.
-- Source files carry an `SPDX-License-Identifier: GPL-3.0-only` header.
+- Source files carry an `SPDX-License-Identifier: GPL-3.0-or-later` header.
 - Commit messages: imperative mood, with a body explaining what + why.
 - Do not auto-commit; stage changes and describe what you did.

CHANGELOG.md

@@ -12,6 +12,8 @@ Dependency and toolchain refresh — no codec or public-API changes.
 
 ### Changed
 
+- Relicensed source SPDX headers from GPL-3.0-only to GPL-3.0-or-later
+  (aligns with the Meshtastic org standard; the LICENSE file is unchanged).
 - Built with Kotlin 2.4.10 (was 2.4.0).
 - junit-framework (JVM test suite only) updated to 6.1.2.
 

CONTRIBUTING.md

@@ -66,7 +66,7 @@ and `explicitApi()`. After an **intentional** public-API change, run
 ## Reusing code from sibling Meshtastic-org projects
 
 kzstd is GPL-3.0, the same license as the other Meshtastic projects, so lifting
-code from them is allowed. When you do: keep the `SPDX-License-Identifier: GPL-3.0-only`
+code from them is allowed. When you do: keep the `SPDX-License-Identifier: GPL-3.0-or-later`
 header, add a copyright line crediting the source repo, and note the origin in the
 commit message (`Origin: <repo>/<path> @ <sha>`).
 

build.gradle.kts

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 import org.gradle.api.tasks.bundling.AbstractArchiveTask
 import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 

scripts/train_test_dict.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# SPDX-License-Identifier: GPL-3.0-only
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Generate a small, TAK-free TRAINED zstd dictionary for kzstd's test suite.
 
 Deterministic: a fixed RNG seed produces the same synthetic corpus, so the

settings.gradle.kts

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 pluginManagement {
     repositories {
         gradlePluginPortal()

src/commonMain/kotlin/org/meshtastic/kzstd/Zstd.kt

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 package org.meshtastic.kzstd
 
 import org.meshtastic.kzstd.internal.PureZstdDecoder

src/commonMain/kotlin/org/meshtastic/kzstd/ZstdDictionary.kt

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 package org.meshtastic.kzstd
 
 import org.meshtastic.kzstd.internal.MatchIndex

src/commonMain/kotlin/org/meshtastic/kzstd/ZstdException.kt

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 package org.meshtastic.kzstd
 
 /**

src/commonMain/kotlin/org/meshtastic/kzstd/internal/BitReader.kt

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-License-Identifier: GPL-3.0-or-later
 package org.meshtastic.kzstd.internal
 
 import org.meshtastic.kzstd.ZstdException