The new experience (#201)

* new launcher and save converts and pipeline

* fixing bugs

src/core/Version.lua

@@ -4,14 +4,22 @@
 -- tests.
 
 local Version = {
-  engine = "1.0.0",       -- game/engine release (semver triple)
+  engine = "0.0.0-dev",   -- game/engine release (semver).  Repo default is the
+                          -- "-dev" placeholder; CI stamps the real X.Y.Z into
+                          -- the packed game.love only, never the working tree.
+  shell = 1,              -- native-shell contract this build implements
+  minShell = 1,           -- lowest shell contract that can RUN this payload.
+                          -- Bump only when a payload needs a newer native
+                          -- binary (e.g. a LOVE version bump); an older shell
+                          -- refuses to chainload a payload whose minShell
+                          -- exceeds the shell it provides.
   modApi = 2,             -- mod API major (manifest `api`)
   linkProtocol = 2,       -- link handshake wire version (Handshake.PROTOCOL)
   saveFormat = 4,         -- save.meta.format
   cache = "rom-cache-v5", -- ROM import cache generation (RomImporter marker)
 }
 
--- "gen1recomp v1.0.0"
+-- "gen1recomp v0.0.0-dev" (or the stamped release version in shipped builds)
 function Version.title(base)
   return (base or "gen1recomp")
     .. " v" .. Version.engine