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/engine/src/cmd/diagnostics.rs

@@ -24,7 +24,7 @@ pub static COMMANDS: &[CommandSpec] = &[
     CommandSpec::new("diagnostics.crash_test", "Crash Test", crash_test).noundo().enabled(crash_test_enabled).params(
         "mode: panic | kernel | abort. Checks that crash reports work: panic = an internal error in this command (caught; \
          the design is unchanged), kernel = one inside the geometry kernel (caught), abort = the app ends at once (reported \
-         at the next start). Only when the SOLVECRAFT_CRASH_TEST environment variable is set",
+         at the next start). Only when the SOLIDCRAFT_CRASH_TEST environment variable is set",
     ),
 ];
 
@@ -52,18 +52,18 @@ fn clear(_: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn crash_test_enabled(_: &Session) -> std::result::Result<(), String> {
-    if std::env::var_os("SOLVECRAFT_CRASH_TEST").is_some() { Ok(()) } else { Err("set SOLVECRAFT_CRASH_TEST to use the crash test".into()) }
+    if solidcraft_geom::env::var_os("CRASH_TEST").is_some() { Ok(()) } else { Err("set SOLIDCRAFT_CRASH_TEST to use the crash test".into()) }
 }
 
 // The one deliberate panic: it proves the crash reports work, and runs only when asked for with
-// SOLVECRAFT_CRASH_TEST.
+// SOLIDCRAFT_CRASH_TEST.
 #[allow(clippy::panic)]
 fn crash_test(_: &mut Session, p: &Value) -> Result<Value> {
     let cmd = "diagnostics.crash_test";
     match str_(p, "mode") {
         Some("panic") => std::panic::panic_any(String::from("crash test: an internal error in a command")),
         Some("kernel") => {
-            solvecraft_kernel::guard("crash test", || -> solvecraft_kernel::Result<()> {
+            solidcraft_kernel::guard("crash test", || -> solidcraft_kernel::Result<()> {
                 std::panic::panic_any(String::from("an internal error in the kernel"))
             })?;
             Err(EngineError::Other("crash test: the kernel error was not caught".into()))