refactor: hard-fork GSD -> MSD (Make Software Done)

Mechanical rename produced by scripts/msd-rename.cjs: gsd/Gsd/GSD -> msd/Msd/MSD
across contents and paths, upstream package/repo coordinates -> @golem15/msd-core
and golem15com/msd-core. Deep links into upstream history, sibling upstream
packages, the GSD-2 import feature, CHANGELOG.md and .changeset/ are kept as-is.

Hand edits on top: MSD block-letter banner and logos, LICENSE copyright line,
package/plugin identity, regenerated lockfile, install-tree fixtures, derived
registries and benchmark baseline; migration checksum baseline re-locked
(MSD keeps its own install state, so no install had applied the old sums);
sort-order and regex-escaped expectations in tests adjusted.

scripts/lib/exit-code-registry.cjs

@@ -1,9 +1,9 @@
 'use strict';
 
 // GENERATED FILE — DO NOT EDIT BY HAND.
-// Source of truth: gsd-core/bin/shared/exit-codes.json. Regenerate with:
+// Source of truth: msd-core/bin/shared/exit-codes.json. Regenerate with:
 //   node scripts/gen-exit-code-registry.cjs --write
-// This exact content is emitted to THREE locations — gsd-core/bin/lib/exit-code-registry.cjs,
+// This exact content is emitted to THREE locations — msd-core/bin/lib/exit-code-registry.cjs,
 // scripts/lib/exit-code-registry.cjs, and hooks/lib/exit-code-registry.js (the latter two
 // committed so scripts/ and hooks/ consumers work on an unbuilt clone) — all byte-compared by
 // `npm run lint:generated-sync` (#3905 ADR-3889 Phase 1; #3906 Phase 2 added the second copy;
@@ -52,7 +52,7 @@ const EXIT_CODES = Object.freeze([
     code: 80,
     name: "DEGRADED",
     meaning: "Ran to completion and is reporting a condition through its result payload rather than as a process failure",
-    owner: "gsd-tools",
+    owner: "msd-tools",
     authorizedBy: "ADR-3889 + ADR-2980",
   })
 ]);