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/artifacts.test.cjs

@@ -1,7 +1,7 @@
 'use strict';
 
 /**
- * Characterization tests for the canonical GSD artifact registry.
+ * Characterization tests for the canonical MSD artifact registry.
  * Locks the exact membership of CANONICAL_EXACT, the CANONICAL_PATTERNS
  * shape, and the isCanonicalPlanningFile predicate.
  */
@@ -12,7 +12,7 @@ const {
   CANONICAL_EXACT,
   CANONICAL_PATTERNS,
   isCanonicalPlanningFile,
-} = require('../gsd-core/bin/lib/artifacts.cjs');
+} = require('../msd-core/bin/lib/artifacts.cjs');
 
 describe('CANONICAL_EXACT', () => {
   test('is a Set', () => {
@@ -59,19 +59,19 @@ describe('isCanonicalPlanningFile', () => {
   });
 
   test('#3227: state.json (machine-readable state contract) is a canonical .planning/ artifact', () => {
-    // gsd-core writes .planning/state.json at every step boundary
+    // msd-core writes .planning/state.json at every step boundary
     // (src/state-contract.cts). Before #3227 it was absent from the
     // registry, so validate health would falsely flag it W019
-    // "Unrecognized" on every GSD project.
+    // "Unrecognized" on every MSD project.
     assert.ok(CANONICAL_EXACT.has('state.json'), 'state.json must be in CANONICAL_EXACT');
     assert.strictEqual(isCanonicalPlanningFile('state.json'), true);
   });
 
   test('#3224: WINDOWS.md (broken-windows ledger) is a canonical .planning/ artifact', () => {
-    // gsd-core itself writes .planning/WINDOWS.md (src/broken-windows.cts,
+    // msd-core itself writes .planning/WINDOWS.md (src/broken-windows.cts,
     // LEDGER_FILE_NAME = 'WINDOWS.md'). Before #3224 it was absent from the
     // registry, so validate health flagged it W019 "Unrecognized" with advice to
-    // delete a ledger that can gate /gsd-ship under workflow.windows_enforce.
+    // delete a ledger that can gate /msd-ship under workflow.windows_enforce.
     assert.ok(CANONICAL_EXACT.has('WINDOWS.md'), 'WINDOWS.md must be in CANONICAL_EXACT');
     assert.strictEqual(isCanonicalPlanningFile('WINDOWS.md'), true);
   });
@@ -80,7 +80,7 @@ describe('isCanonicalPlanningFile', () => {
     // workflows/graduation.md's own graduation-target table instructs the agent to
     // append to .planning/PATTERNS.md for the `patterns` category. Before #4282 it
     // was absent from the registry, so validate health flagged it W019
-    // "Unrecognized" with advice to archive/delete a file gsd-core itself produces.
+    // "Unrecognized" with advice to archive/delete a file msd-core itself produces.
     // Distinct from the per-phase NN-PATTERNS.md (templates/README.md), which lives
     // under a phase subdirectory and was never subject to W019 in the first place.
     assert.ok(CANONICAL_EXACT.has('PATTERNS.md'), 'PATTERNS.md must be in CANONICAL_EXACT');
@@ -121,7 +121,7 @@ describe('isCanonicalPlanningFile', () => {
 // runtime loads — testing text content tests the deployed contract.
 
 /**
- * Tests for canonical artifact registry and gsd-health W019 lint (#2448).
+ * Tests for canonical artifact registry and msd-health W019 lint (#2448).
  */
 
 const { test, describe, after } = require('node:test');
@@ -131,14 +131,14 @@ const path = require('node:path');
 const os = require('node:os');
 const helpers = require('./helpers.cjs');
 
-const { isCanonicalPlanningFile, CANONICAL_EXACT } = require('../gsd-core/bin/lib/artifacts.cjs');
-const { cmdValidateHealth } = require('../gsd-core/bin/lib/verify.cjs');
+const { isCanonicalPlanningFile, CANONICAL_EXACT } = require('../msd-core/bin/lib/artifacts.cjs');
+const { cmdValidateHealth } = require('../msd-core/bin/lib/verify.cjs');
 
 const _dirsToClean = [];
 after(() => { for (const d of _dirsToClean) helpers.cleanup(d); });
 
 function makeTempProject(files = {}) {
-  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-2448-'));
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'msd-2448-'));
   _dirsToClean.push(dir);
   fs.mkdirSync(path.join(dir, '.planning', 'phases'), { recursive: true });
   for (const [rel, content] of Object.entries(files)) {
@@ -168,7 +168,7 @@ describe('artifacts.cjs — isCanonicalPlanningFile', () => {
     assert.ok(isCanonicalPlanningFile('v2.3.1-MILESTONE-AUDIT.md'));
   });
 
-  test('returns true for RETROSPECTIVE.md (produced by /gsd-complete-milestone)', () => {
+  test('returns true for RETROSPECTIVE.md (produced by /msd-complete-milestone)', () => {
     assert.strictEqual(isCanonicalPlanningFile('RETROSPECTIVE.md'), true);
   });
 
@@ -184,7 +184,7 @@ describe('artifacts.cjs — isCanonicalPlanningFile', () => {
   });
 });
 
-describe('gsd-health W019 — unrecognized .planning/ root files', () => {
+describe('msd-health W019 — unrecognized .planning/ root files', () => {
   test('W019 fires for a non-canonical .md file at .planning/ root', () => {
     const dir = makeTempProject({
       ...BASE_FILES,
@@ -259,7 +259,7 @@ describe('gsd-health W019 — unrecognized .planning/ root files', () => {
 
   test('templates/README.md exists and documents W019', () => {
     const readme = fs.readFileSync(
-      path.join(__dirname, '../gsd-core/templates/README.md'), 'utf-8'
+      path.join(__dirname, '../msd-core/templates/README.md'), 'utf-8'
     );
     assert.ok(readme.includes('W019'), 'README.md documents W019');
     assert.ok(readme.includes('artifacts.cjs'), 'README.md references artifacts.cjs for adding new artifacts');