Rename SolveCraft to SolidCraft everywhere, with compatibility shims (#389)

* WIP deep rename (not for push)

* WIP2

* WIP3

* WIP4 wxs fix

* rustfmt

* Rename the remaining identifiers in merged crash-report code

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/geom/src/env.rs

@@ -0,0 +1,55 @@
+//! SolidCraft's environment variables, read in one place.
+//!
+//! Every variable is `SOLIDCRAFT_<NAME>`. Compatibility shim (see docs/compatibility.md): when
+//! it is unset, the same variable under the product's former prefix is read instead, so
+//! scripts and service files written for earlier releases keep working.
+
+use std::ffi::OsString;
+
+/// The current prefix.
+pub const PREFIX: &str = "SOLIDCRAFT_";
+/// The former prefix, read only as a fallback.
+pub const LEGACY_PREFIX: &str = "SOLVECRAFT_";
+
+/// `SOLIDCRAFT_<name>`, else the legacy `SOLVECRAFT_<name>`. `name` is the part after the
+/// prefix, e.g. `"RECOVERY_DIR"`.
+pub fn var_os(name: &str) -> Option<OsString> {
+    lookup(name, |k| std::env::var_os(k))
+}
+
+/// [`var_os`] as UTF-8; a value that is not valid UTF-8 counts as unset.
+pub fn var(name: &str) -> Option<String> {
+    var_os(name).and_then(|v| v.into_string().ok())
+}
+
+fn lookup(name: &str, get: impl Fn(&str) -> Option<OsString>) -> Option<OsString> {
+    get(&format!("{PREFIX}{name}")).or_else(|| get(&format!("{LEGACY_PREFIX}{name}")))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::HashMap;
+
+    fn env(pairs: &[(&str, &str)]) -> impl Fn(&str) -> Option<OsString> {
+        let m: HashMap<String, OsString> = pairs.iter().map(|(k, v)| ((*k).to_string(), OsString::from(*v))).collect();
+        move |k| m.get(k).cloned()
+    }
+
+    #[test]
+    fn new_prefix_wins_over_legacy() {
+        let get = env(&[("SOLIDCRAFT_RECOVERY_DIR", "/new"), ("SOLVECRAFT_RECOVERY_DIR", "/old")]);
+        assert_eq!(lookup("RECOVERY_DIR", get), Some(OsString::from("/new")));
+    }
+
+    #[test]
+    fn legacy_prefix_is_the_fallback() {
+        let get = env(&[("SOLVECRAFT_CONTROL_PORT", "4000")]);
+        assert_eq!(lookup("CONTROL_PORT", get), Some(OsString::from("4000")));
+    }
+
+    #[test]
+    fn unset_in_both_is_none() {
+        assert_eq!(lookup("WAYLAND", env(&[("OTHER", "1")])), None);
+    }
+}

crates/geom/src/lib.rs

@@ -1,4 +1,4 @@
-//! Geometry foundation for SolveCraft: 2D/3D vectors, sketch planes, axis-aligned boxes,
+//! Geometry foundation for SolidCraft: 2D/3D vectors, sketch planes, axis-aligned boxes,
 //! triangle meshes with their measures (volume, area, centroid), and freeform surface maths
 //! (B-spline basis and NURBS surfaces in [`bspline`], T-splines in [`tspline`]). Units are
 //! millimetres.
@@ -9,6 +9,7 @@
 #![forbid(unsafe_code)]
 
 pub mod bspline;
+pub mod env;
 mod mesh;
 mod plane;
 mod profile;