docs(license): carry each ported package's license in its crate

The MIT packages Composer and Shirabe are ported from require their
copyright notices to be kept, and the Composer notice was only reachable
through the submodule.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2 files changed, 56 insertions, 1 deletions

diff --git a/crates/shirabe-php-src/LICENSE b/crates/shirabe-php-src/LICENSE
new file mode 100644
index 00000000..c0b86f56
--- /dev/null
+++ b/crates/shirabe-php-src/LICENSE
@@ -0,0 +1,55 @@
+## PHP License 4.0 (3-clause BSD)
+
+Applies to everything in this crate except `src/standard/strnatcmp.rs`.
+
+Copyright © 1999–2026, The PHP Group and Contributors.
+Copyright © 1999–2026, Zend Technologies Ltd., a subsidiary company of Perforce Software, Inc.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+## zlib License
+
+`src/standard/strnatcmp.rs` derives from `ext/standard/strnatcmp.c`, which php-src itself
+carries under the zlib license.
+
+strnatcmp.c -- Perform 'natural order' comparisons of strings in C.
+Copyright (C) 2000 by Martin Pool <mbp@humbug.org.au>
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
diff --git a/crates/shirabe-php-src/src/lib.rs b/crates/shirabe-php-src/src/lib.rs
index a5682e24..93d6e052 100644
--- a/crates/shirabe-php-src/src/lib.rs
+++ b/crates/shirabe-php-src/src/lib.rs
@@ -1,5 +1,5 @@
 //! Rust port from the original C implementation in php-src.
-//! See `LICENSE.md` at the repository root.
+//! See the `LICENSE` file in this crate.
 #![allow(special_module_name)]
 //!
 //! Rules for this crate: