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.

tests/derive-progress.property.test.cjs

@@ -3,7 +3,7 @@
 /**
  * Property-based tests for deriveProgressFromRoadmap column-invariance (#2137).
  *
- * Module: gsd-core/bin/lib/phase-lifecycle.cjs
+ * Module: msd-core/bin/lib/phase-lifecycle.cjs
  * Exported: deriveProgressFromRoadmap(roadmapContent)
  *
  * The #2137 fix re-reads the `## Progress` table by HEADER NAME (locate the
@@ -34,7 +34,7 @@ const { describe, test } = require('node:test');
 const assert = require('node:assert/strict');
 const fc = require('./helpers/fast-check-setup.cjs');
 
-const { deriveProgressFromRoadmap } = require('../gsd-core/bin/lib/phase-lifecycle.cjs');
+const { deriveProgressFromRoadmap } = require('../msd-core/bin/lib/phase-lifecycle.cjs');
 
 // A header name for an INJECTED (unrelated) column. It must not collide with the
 // reader's column-name lookups: not exactly `phase` / `status` / `completed`