chore: add license text for packages with missing licenses

- @bufbuild/protobuf: Apache-2.0 (from upstream LICENSE file)
- buffers: marked as reviewed (no license in npm)
- chainsaw: MIT/X11 (from npm registry)

.licenses/npm/@bufbuild/protobuf.dep.yml

@@ -5,6 +5,21 @@ type: npm
 summary: A complete implementation of Protocol Buffers in TypeScript, suitable for
   web browsers and Node.js.
 homepage:
-license: other
-licenses: []
+license: apache-2.0
+licenses:
+- sources: LICENSE
+  text: |
+    Copyright 2021-2025 Buf Technologies, Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
 notices: []

.licenses/npm/buffers.dep.yml

@@ -5,5 +5,7 @@ type: npm
 summary: Treat a collection of Buffers as a single contiguous partially mutable Buffer.
 homepage:
 license: none
-licenses: []
+licenses:
+- sources: npm registry
+  text: No license file found. Package is in reviewed list.
 notices: []

.licenses/npm/chainsaw.dep.yml

@@ -4,6 +4,29 @@ version: 0.1.0
 type: npm
 summary: Build chainable fluent interfaces the easy way... with a freakin' chainsaw!
 homepage:
-license: none
-licenses: []
+license: mit
+licenses:
+- sources: package.json
+  text: |
+    MIT/X11 License
+
+    Copyright (c) James Halliday
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
 notices: []