Update source files

crates/borders-core/src/build_info.rs

@@ -0,0 +1,21 @@
+//! Build metadata injected at compile time
+
+/// The version of the application from Cargo.toml
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+
+/// The git commit hash from .source-commit file or git command
+pub const GIT_COMMIT: &str = env!("BUILD_GIT_COMMIT");
+
+/// The build timestamp in RFC3339 format (UTC)
+pub const BUILD_TIME: &str = env!("BUILD_TIME");
+
+/// Get the git commit hash (short form, first 7 characters)
+pub fn git_commit_short() -> &'static str {
+    let full = GIT_COMMIT;
+    if full.len() >= 7 { &full[..7] } else { full }
+}
+
+/// Full build information formatted as a string
+pub fn info() -> String {
+    format!("Iron Borders v{} ({})\nBuilt: {}", VERSION, git_commit_short(), BUILD_TIME)
+}