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.

tests/no-private-binary-resolution.rule.test.cjs

@@ -4,7 +4,7 @@
  * no-private-binary-resolution.rule.test.cjs
  *
  * RuleTester unit tests for the local/no-private-binary-resolution ESLint rule.
- * Ids (V1-V8, I1-I9) map to .gsd/phase/chore-3619-no-bare-binary-spawn/50-test-matrix.md.
+ * Ids (V1-V8, I1-I9) map to .msd/phase/chore-3619-no-bare-binary-spawn/50-test-matrix.md.
  *
  * RuleTester feeds fixtures to the rule directly and does not scan this test
  * file's own source, so the self-flagging problem that forced eslint.config.mjs
@@ -232,7 +232,7 @@ describe('no-private-binary-resolution: invalid cases', () => {
     });
   });
 
-  test("I6: '.EXE;.CMD;.BAT;.COM' — the deleted gsd-tools shape verbatim", () => {
+  test("I6: '.EXE;.CMD;.BAT;.COM' — the deleted msd-tools shape verbatim", () => {
     ruleTester.run('no-private-binary-resolution', rule, {
       valid: [],
       invalid: [