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/coderabbit/capability.json

@@ -3,11 +3,11 @@
   "role": "reviewer",
   "version": "1.14.0",
   "title": "CodeRabbit",
-  "description": "CodeRabbit CLI — cross-AI /gsd:review reviewer lane only; not a GSD install target (no runtime body, no artifacts). Reviews the working-tree diff (`coderabbit review --prompt-only`), not the source tree, and accepts neither a prompt nor a model flag; findings are down-weighted in consensus (evidenceClass: diff-only).",
+  "description": "CodeRabbit CLI — cross-AI /msd:review reviewer lane only; not a MSD install target (no runtime body, no artifacts). Reviews the working-tree diff (`coderabbit review --prompt-only`), not the source tree, and accepts neither a prompt nor a model flag; findings are down-weighted in consensus (evidenceClass: diff-only).",
   "tier": "full",
   "requires": [],
   "engines": {
-    "gsd": ">=1.8.0"
+    "msd": ">=1.8.0"
   },
   "reviewer": {
     "slug": "coderabbit",