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/lint-test-file-count.cjs

@@ -2,7 +2,7 @@
 /**
  * lint-test-file-count.cjs — max 2 test files per production module.
  *
- * Scans sdk/src/query/, sdk/src/, gsd-core/bin/lib/, bin/ for production
+ * Scans sdk/src/query/, sdk/src/, msd-core/bin/lib/, bin/ for production
  * modules, then counts matching test files in tests/ and sdk/src (recursive). Cap is 2
  * (primary + one integration). Over-limit clusters must be in the allowlist with the
  * EXACT set of test filenames grandfathered (identity ratchet via allowlist-ratchet.cjs).
@@ -23,7 +23,7 @@ const ROOT = path.join(__dirname, '..');
 const PROD_DIRS = [
   path.join(ROOT, 'sdk', 'src', 'query'),
   path.join(ROOT, 'sdk', 'src'),
-  path.join(ROOT, 'gsd-core', 'bin', 'lib'),
+  path.join(ROOT, 'msd-core', 'bin', 'lib'),
   path.join(ROOT, 'bin'),
 ];
 const TEST_DIRS = [