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/gen-registry.cjs

@@ -13,7 +13,7 @@
  *
  * NOT to be confused with `scripts/gen-capability-registry.cjs`: that script
  * generates the RUNTIME capability manifest consumed by the host at runtime
- * (`gsd-core/bin/lib/capability-registry.cjs`, built from every
+ * (`msd-core/bin/lib/capability-registry.cjs`, built from every
  * `capabilities/<id>/capability.json` declaration). THIS script instead
  * generates the human-facing DOCUMENTATION catalog pages
  * (`docs/registries/*.md`) from the third-party discoverability registry
@@ -35,7 +35,7 @@ const path = require('node:path');
 
 const { ExitError, runMain } = require('./lib/cli-exit.cjs');
 const { renderMarkdown } = require('./registry-schema.cjs');
-const { normalizeEol } = require('../gsd-core/bin/lib/text-lines.cjs');
+const { normalizeEol } = require('../msd-core/bin/lib/text-lines.cjs');
 
 const SOURCES = [
   { type: 'capability', jsonFile: 'capabilities.json', mdFile: 'capability-registry.md' },