chore: add missing SPDX headers; drop stale development CI trigger

number_parse.{hpp,cpp} (pj_base, Apache-2.0) lacked their
SPDX-License-Identifier headers -- the dual-license boundary relies on
per-file headers, so add them. All four branch-triggered workflows still
keyed on the deleted `development` branch; restrict them to `main`.

Addresses SUSTAINABILITY.md BLD-4 (the two violating files) and BLD-5.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: facontidavide

.github/workflows/linux-ci.yml

@@ -1,9 +1,9 @@
 name: Linux CI
 on:
   push:
-    branches: [development, main]
+    branches: [main]
   pull_request:
-    branches: [development, main]
+    branches: [main]
     types: [opened, synchronize, reopened, ready_for_review]
   workflow_dispatch: {}
 

.github/workflows/macos-ci.yml

@@ -1,9 +1,9 @@
 name: macOS CI
 on:
   push:
-    branches: [development, main]
+    branches: [main]
   pull_request:
-    branches: [development, main]
+    branches: [main]
     types: [opened, synchronize, reopened, ready_for_review]
   workflow_dispatch: {}
 

.github/workflows/pre-commit.yml

@@ -1,9 +1,9 @@
 name: pre-commit
 on:
   push:
-    branches: [development, main]
+    branches: [main]
   pull_request:
-    branches: [development, main]
+    branches: [main]
     types: [opened, synchronize, reopened, ready_for_review]
   workflow_dispatch: {}
 

.github/workflows/windows-ci.yml

@@ -1,9 +1,9 @@
 name: Windows CI
 on:
   push:
-    branches: [development, main]
+    branches: [main]
   pull_request:
-    branches: [development, main]
+    branches: [main]
     types: [opened, synchronize, reopened, ready_for_review]
   workflow_dispatch: {}
 

pj_base/include/pj_base/number_parse.hpp

@@ -1,4 +1,6 @@
 #pragma once
+// Copyright 2026 Davide Faconti
+// SPDX-License-Identifier: Apache-2.0
 
 #include <charconv>
 #include <optional>

pj_base/src/number_parse.cpp

@@ -1,3 +1,6 @@
+// Copyright 2026 Davide Faconti
+// SPDX-License-Identifier: Apache-2.0
+
 #include "pj_base/number_parse.hpp"
 
 #include <cerrno>