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/kimi-tool-mapping.test.cjs

@@ -6,7 +6,7 @@
  * must not be emitted.
  */
 
-process.env.GSD_TEST_MODE = '1';
+process.env.MSD_TEST_MODE = '1';
 
 const { test, describe } = require('node:test');
 const assert = require('node:assert/strict');
@@ -17,7 +17,7 @@ const {
 } = require('../bin/install.js');
 
 describe('convertKimiToolName', () => {
-  test('maps Claude and GSD tool names to documented Kimi module paths', () => {
+  test('maps Claude and MSD tool names to documented Kimi module paths', () => {
     const expectedMappings = new Map([
       ['Read', 'kimi_cli.tools.file:ReadFile'],
       ['Write', 'kimi_cli.tools.file:WriteFile'],