feat(composer): bake the dev build warning deadline in at build time

Composer defines COMPOSER_DEV_WARNING_TIME from its phar stub when the
compiled version is a commit hash rather than a tag, so the value exists
only in the build artifact. It was a todo!() in the PHP shim, leaving the
warning branch in Application::do_run unreachable.

A build script now derives it the way Compiler does, from git describe
and the HEAD commit date, and composer::COMPOSER_DEV_WARNING_TIME holds
the result as a Rust constant instead of a runtime-defined one.

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

2 files changed, 12 insertions, 2 deletions

diff --git a/crates/shirabe/src/composer.rs b/crates/shirabe/src/composer.rs
index 356aefc1..fca19539 100644
--- a/crates/shirabe/src/composer.rs
+++ b/crates/shirabe/src/composer.rs
@@ -21,6 +21,16 @@ pub const RELEASE_DATE: &str = "2026-04-14 13:31:52";
 pub const SOURCE_VERSION: &str = "";
 pub const RUNTIME_API_VERSION: &str = "2.2.2";
 
+/// The deadline after which a development build reports itself as outdated, or `None` for a build
+/// made from a tagged revision. Baked in by `build.rs`.
+///
+/// Composer declares this as the global constant COMPOSER_DEV_WARNING_TIME from its phar stub, so
+/// a plugin can read it back with `defined()`/`constant()`. Here it is a Rust constant, and
+/// plugins cannot observe it. Technically speaking, it is incompatible with Composer, but trivial
+/// enough.
+pub const COMPOSER_DEV_WARNING_TIME: Option<i64> =
+    include!(concat!(env!("OUT_DIR"), "/dev_warning_time.rs"));
+
 pub fn get_version() -> String {
     if VERSION == "@package_version@" {
         return SOURCE_VERSION.to_string();
diff --git a/crates/shirabe/src/console/application.rs b/crates/shirabe/src/console/application.rs
index 36151563..96f80d9b 100644
--- a/crates/shirabe/src/console/application.rs
+++ b/crates/shirabe/src/console/application.rs
@@ -2301,10 +2301,10 @@ impl ApplicationHandle {
                 io.write_error("<warning>Composer is operating slower than normal because you have Xdebug enabled. See https://getcomposer.org/xdebug</warning>");
             }
 
-            if defined("COMPOSER_DEV_WARNING_TIME")
+            if let Some(dev_warning_time) = composer::COMPOSER_DEV_WARNING_TIME
                 && command_name.as_deref() != Some("self-update")
                 && command_name.as_deref() != Some("selfupdate")
-                && time() > shirabe_php_shim::composer_dev_warning_time()
+                && time() > dev_warning_time
             {
                 io.write_error(&format!(
                     "<warning>Warning: This development build of Composer is over 60 days old. It is recommended to update it by running \"{} self-update\" to get the latest version.</warning>",