Release under the SolidCraft name: binaries, assets and installers (#383)

* Release under the SolidCraft name: binaries, assets and installers

The desktop binary is now `solidcraft` and the CLI `solidcraft-cli` (the two app packages
are renamed; their folders move with the rest of the rename later). Every release asset is
named solidcraft-<ver>-… / SolidCraft-<ver>-windows-x64.exe, and the installers show the
SolidCraft product name.

Kept so existing installs keep updating (docs/compatibility.md):
- `solvecraft-cli` alias binary in every package, forwarding to solidcraft-cli with a
  deprecation note on stderr (tests/legacy_alias.rs).
- Linux app ID ai.storyteller.solvecraft (Flatpak ID, desktop entry, Wayland app_id).
- MSI UpgradeCode, so the MSI upgrades in place.
- deb Replaces/Conflicts/Provides and rpm Obsoletes/Provides solvecraft.
- An old-named .zsync copy so earlier AppImages find updates; a legacy .flatpakrepo copy.
- .solvecraft file associations; SOLVECRAFT_* fallbacks in the packaging scripts.

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

* MSI: register the legacy .solvecraft extension without a duplicate open verb

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>

apps/solvecraft-cli/tests/commands_output.rs

@@ -4,7 +4,7 @@ use std::process::{Command, Stdio};
 
 #[test]
 fn registry_output_is_complete_json() {
-    let output = Command::new(env!("CARGO_BIN_EXE_solvecraft-cli")).arg("commands").output().unwrap();
+    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("commands").output().unwrap();
     assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
     let registry: serde_json::Value = serde_json::from_slice(&output.stdout).unwrap();
     let commands = registry.as_array().unwrap();
@@ -16,7 +16,7 @@ fn registry_output_is_complete_json() {
 
 #[test]
 fn closed_registry_pipe_exits_without_panicking() {
-    let mut child = Command::new(env!("CARGO_BIN_EXE_solvecraft-cli")).arg("commands").stdout(Stdio::piped()).stderr(Stdio::piped()).spawn().unwrap();
+    let mut child = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("commands").stdout(Stdio::piped()).stderr(Stdio::piped()).spawn().unwrap();
     // Close our read end before waiting. No sleeps or timing threshold are needed:
     // the registry is larger than the pipe buffer, so it cannot all be written first.
     drop(child.stdout.take());