Rebrand to Galaxy, major improvements to Bedrock support, still needs some TLC though

crates/galaxy_core/src/session_id.rs

@@ -0,0 +1,27 @@
+use serde::{Deserialize, Serialize};
+
+/// Unique identifier for a terminal session.
+///
+/// Each bootstrapped subshell (including SSH sessions) gets its own `SessionId`.
+/// This type is defined in `galaxy_core` so that lower-level crates (e.g. `repo_metadata`)
+/// can reference it without depending on the `app` crate.
+#[derive(Copy, Clone, Debug, Default, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct SessionId(u64);
+
+impl SessionId {
+    pub fn as_u64(&self) -> u64 {
+        self.0
+    }
+}
+
+impl From<u64> for SessionId {
+    fn from(id: u64) -> Self {
+        Self(id)
+    }
+}
+
+impl From<SessionId> for u64 {
+    fn from(session_id: SessionId) -> Self {
+        session_id.as_u64()
+    }
+}