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-phase-enumeration-drift.cjs

@@ -202,8 +202,8 @@
  *     all; only shaped like one because `phasesDir` is a substring of the
  *     joined path.
  *   - `src/audit.cts` `listAuditPhaseTargets` (#3458): the shared active-root
- *     enumeration for the pre-milestone-close audit gate (`gsd-tools.cjs
- *     audit-open`, called by `/gsd:complete-milestone`'s pre-close gate).
+ *     enumeration for the pre-milestone-close audit gate (`msd-tools.cjs
+ *     audit-open`, called by `/msd:complete-milestone`'s pre-close gate).
  *     `scanUatGaps`, `scanVerificationGaps`, `scanContextQuestions`, and
  *     `scanDeferredItems` used to each hand-roll this same readdirSync
  *     independently (four copies of one re-derivation — the very drift class