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/audit-workflow-script-paths.cjs

@@ -3,7 +3,7 @@
 /**
  * Post-install path audit for workflow-invoked scripts (#2995).
  *
- * Walks workflowsDir, extracts every `${GSD_HOME[...]}/<path>.<cjs|js|sh>`
+ * Walks workflowsDir, extracts every `${MSD_HOME[...]}/<path>.<cjs|js|sh>`
  * token, and asserts:
  *   1. the file exists in the repo at that <path> (catches typos)
  *   2. <path>'s first segment is in installedPrefixes (catches the
@@ -21,10 +21,10 @@ const AUDIT_FINDING = Object.freeze({
   NOT_INSTALLED: 'not_installed',
 });
 
-// Match `${GSD_HOME}` or `${GSD_HOME:-...}` followed by a /-rooted path
+// Match `${MSD_HOME}` or `${MSD_HOME:-...}` followed by a /-rooted path
 // ending in .cjs/.js/.sh. The path is captured verbatim (relative to
 // the install root).
-const REF_RE = /\$\{GSD_HOME(?::-[^}]*)?\}\/([A-Za-z0-9_./-]+\.(?:cjs|js|sh))/g;
+const REF_RE = /\$\{MSD_HOME(?::-[^}]*)?\}\/([A-Za-z0-9_./-]+\.(?:cjs|js|sh))/g;
 
 function listWorkflowFiles(dir) {
   if (!fs.existsSync(dir)) return [];