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/context-utilization.test.cjs

@@ -1,7 +1,7 @@
 'use strict';
 
 /**
- * Pure classifier for the gsd-health --context guard.
+ * Pure classifier for the msd-health --context guard.
  *
  * Thresholds:
  *   < 60%   healthy
@@ -16,7 +16,7 @@
 const { describe, test } = require('node:test');
 const assert = require('node:assert/strict');
 
-const { classifyContextUtilization, STATES } = require('../gsd-core/bin/lib/context-utilization.cjs');
+const { classifyContextUtilization, STATES } = require('../msd-core/bin/lib/context-utilization.cjs');
 
 describe('STATES constant exposes the three boundary names', () => {
   test('exports HEALTHY, WARNING, CRITICAL', () => {