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/check-alias-drift.cjs

@@ -7,7 +7,7 @@ const { ExitError, runMain } = require('./lib/cli-exit.cjs');
 const { FAMILIES, ALIAS_TABLE } = require('./lib/alias-drift-families.cjs');
 
 const ROOT = path.resolve(__dirname, '..');
-const aliasesPath = path.join(ROOT, 'gsd-core', 'bin', 'lib', `${ALIAS_TABLE}.cjs`);
+const aliasesPath = path.join(ROOT, 'msd-core', 'bin', 'lib', `${ALIAS_TABLE}.cjs`);
 
 function fail(message) {
   process.stderr.write(`${message}\n`);
@@ -40,7 +40,7 @@ function main() {
   const families = FAMILIES.map((family) => ({
     commandAliases: family.commandAliases,
     subcommands: family.subcommands,
-    routerPath: path.join(ROOT, 'gsd-core', 'bin', 'lib', `${family.router}.cjs`),
+    routerPath: path.join(ROOT, 'msd-core', 'bin', 'lib', `${family.router}.cjs`),
   }));
 
   for (const family of families) {