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.

capabilities/audit/capability.json

@@ -3,11 +3,11 @@
   "role": "feature",
   "version": "1.14.0",
   "title": "Audit",
-  "description": "Open-artifact audit and UAT-gap audit for milestone close gates; exposes `gsd-tools audit-uat` (cross-phase UAT outstanding items) and `gsd-tools audit-open` (structured open-artifact scan across debug, tasks, threads, todos, seeds, UAT, verification, context-questions).",
+  "description": "Open-artifact audit and UAT-gap audit for milestone close gates; exposes `msd-tools audit-uat` (cross-phase UAT outstanding items) and `msd-tools audit-open` (structured open-artifact scan across debug, tasks, threads, todos, seeds, UAT, verification, context-questions).",
   "tier": "full",
   "requires": [],
   "engines": {
-    "gsd": ">=1.6.0"
+    "msd": ">=1.6.0"
   },
   "runtimeCompat": {
     "supported": [