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.

src/verification-command-router.cts

@@ -6,7 +6,7 @@
  * (runs verification checks like plan-structure/artifacts). Keep them separate.
  *
  * ADR-457 build-at-publish: source in src/verification-command-router.cts,
- * compiled to gsd-core/bin/lib/verification-command-router.cjs (gitignored).
+ * compiled to msd-core/bin/lib/verification-command-router.cjs (gitignored).
  */
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports