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>

docs/compatibility.md

@@ -0,0 +1,26 @@
+# Compatibility shims for the SolveCraft → SolidCraft rename
+
+The product is SolidCraft everywhere. The old name survives only in the shims listed here,
+each kept so that existing installs, scripts and files keep working. Remove a shim only in a
+release whose notes say so.
+
+## Programs and packages (since 0.5.0)
+
+| Shim | Where | Why | Test |
+|---|---|---|---|
+| `solvecraft-cli` alias binary: forwards every argument and stream to `solidcraft-cli`, prints a one-line deprecation note on stderr, exits with its status | `apps/solvecraft-cli/src/alias.rs`; shipped by every package (deb, rpm, tar.gz, AppImage, Flatpak, FreeBSD, MSI, portable zip, macOS CLI zip, Nix) | scripts and MCP client setups (`claude mcp add solvecraft -- solvecraft-cli mcp`) keep working for at least one release | `apps/solvecraft-cli/tests/legacy_alias.rs`; release workflow checks the deb contents |
+| Linux app ID `ai.storyteller.solvecraft` (Flatpak ID, desktop entry, metainfo, MIME and icon file names, Wayland app_id) | `packaging/env.sh` (`APP_ID`), `packaging/linux/*`, the app's `with_app_id` | a new Flatpak ID would be a different app: installed Flatpaks would never update. The desktop entry, metainfo and Wayland app_id must equal the Flatpak ID | packaging-lint workflow; Flatpak smoke test |
+| MSI `UpgradeCode` `6A145FD6-D285-428D-AE84-A69570CDF4DB` (a GUID, no name in it) | `packaging/windows/solidcraft.wxs` | the new MSI upgrades an existing install in place. The install folder moves to `Program Files\SolidCraft` (registry `Software\SolidCraft`); a custom folder chosen for an earlier version is not carried over this once | release workflow (MSI build) |
+| deb `Replaces`/`Conflicts`/`Provides: solvecraft`, rpm `Obsoletes`/`Provides: solvecraft` | `packaging/linux/nfpm.yaml` | installing the `solidcraft` package replaces the old `solvecraft` one instead of clashing with its files | release workflow checks the deb fields |
+| A copy of each AppImage's `.zsync` under the old name `solvecraft-<ver>-linux-<arch>.AppImage.zsync` | `packaging/linux/package.sh` | earlier AppImages carry update information that looks for that name; the copy points at the new AppImage | release workflow |
+| `solvecraft.flatpakrepo` next to `solidcraft.flatpakrepo` | `packaging/flatpak-site.sh` | links in earlier instructions keep working (existing remotes use the repository URL, which is unchanged) | Pages workflow |
+| `.solvecraft` file associations (Windows ProgId extension, macOS document type, freedesktop MIME glob and `application/x-solvecraft` alias) | `packaging/windows/solidcraft.wxs`, `packaging/macos/Info.plist.in`, `packaging/linux/ai.storyteller.solvecraft.mime.xml` | existing design files keep opening in SolidCraft from the file manager | packaging-lint workflow |
+| `SOLVECRAFT_VERSION`, `SOLVECRAFT_BUILD_DATE`, `SOLVECRAFT_MAINTAINER`, `SOLVECRAFT_NO_DESKTOP_INTEGRATION` read when the `SOLIDCRAFT_*` name is unset | `packaging/env.sh`, `packaging/linux/package.sh`, `packaging/linux/AppRun` | build scripts and AppImage users' environments keep working | packaging tests |
+
+## Not kept
+
+- The macOS bundle identifier is now `ai.storyteller.solidcraft`: apps are installed by dragging
+  from the DMG and there is no updater keyed on it. The first launch may ask again for Gatekeeper
+  approval.
+- The GUI binary has no alias: every package's launcher, shortcut and file association runs
+  `solidcraft`.