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/lint-command-contract.cjs

@@ -2,15 +2,15 @@
 /**
  * lint-command-contract.cjs  (ADR-0002)
  *
- * Enforces the commands/gsd/*.md contract across all 65 command files:
+ * Enforces the commands/msd/*.md contract across all 65 command files:
  *
- *   1. name:        present, non-empty, matches gsd: or gsd- prefix
+ *   1. name:        present, non-empty, matches msd: or msd- prefix
  *   2. description: present, non-empty
  *   3. allowed-tools: block present, non-empty, all entries from CANONICAL_TOOLS
  *   4. execution_context @-refs: every @-reference resolves to an existing file on disk
  *   5. execution_context @-refs: each appears on its own line (no trailing prose)
- *   6. every gsd-core/workflows/*.md file is reachable from at least one
- *      commands/agents/skills loader, transitively through gsd-core/**
+ *   6. every msd-core/workflows/*.md file is reachable from at least one
+ *      commands/agents/skills loader, transitively through msd-core/**
  *      (repo-level check, runs once — not per command file)
  *
  * Exit 0 = clean. Exit 1 = violations (with diagnostics).
@@ -32,8 +32,8 @@ function resolveRoot(argv) {
 }
 
 const ROOT          = resolveRoot(process.argv.slice(2));
-const COMMANDS_DIR  = path.join(ROOT, 'commands', 'gsd');
-const GSD_ROOT      = path.join(ROOT, 'gsd-core');
+const COMMANDS_DIR  = path.join(ROOT, 'commands', 'msd');
+const MSD_ROOT      = path.join(ROOT, 'msd-core');
 
 const {
   CANONICAL_TOOLS,
@@ -64,8 +64,8 @@ function walkMarkdownFiles(dir, acc) {
   return acc;
 }
 
-function toGsdRelative(absPath) {
-  return path.relative(GSD_ROOT, absPath).split(path.sep).join('/');
+function toMsdRelative(absPath) {
+  return path.relative(MSD_ROOT, absPath).split(path.sep).join('/');
 }
 
 function checkWorkflowReachability() {
@@ -76,16 +76,16 @@ function checkWorkflowReachability() {
   ];
   const loaderContents = loaderFiles.map(f => fs.readFileSync(f, 'utf-8'));
 
-  const gsdFileAbsPaths = walkMarkdownFiles(GSD_ROOT, []);
-  const gsdFiles = new Map();
-  for (const abs of gsdFileAbsPaths) {
-    gsdFiles.set(toGsdRelative(abs), fs.readFileSync(abs, 'utf-8'));
+  const msdFileAbsPaths = walkMarkdownFiles(MSD_ROOT, []);
+  const msdFiles = new Map();
+  for (const abs of msdFileAbsPaths) {
+    msdFiles.set(toMsdRelative(abs), fs.readFileSync(abs, 'utf-8'));
   }
 
-  const workflowAbsPaths = walkMarkdownFiles(path.join(GSD_ROOT, 'workflows'), []);
-  const workflowPaths = workflowAbsPaths.map(toGsdRelative);
+  const workflowAbsPaths = walkMarkdownFiles(path.join(MSD_ROOT, 'workflows'), []);
+  const workflowPaths = workflowAbsPaths.map(toMsdRelative);
 
-  const unreachable = unreachableWorkflows(loaderContents, gsdFiles, workflowPaths);
+  const unreachable = unreachableWorkflows(loaderContents, msdFiles, workflowPaths);
 
   return { workflowCount: workflowPaths.length, unreachable };
 }
@@ -98,11 +98,11 @@ function check(filePath) {
   const fm       = parseFrontmatter(content);
   const violations = [];
 
-  // 1. name: present + gsd: / gsd- prefix
+  // 1. name: present + msd: / msd- prefix
   if (!fm.name || !fm.name.trim()) {
     violations.push('name: field missing or empty');
-  } else if (!/^gsd[:-]/.test(fm.name.trim())) {
-    violations.push(`name: must start with "gsd:" or "gsd-", got "${fm.name.trim()}"`);
+  } else if (!/^msd[:-]/.test(fm.name.trim())) {
+    violations.push(`name: must start with "msd:" or "msd-", got "${fm.name.trim()}"`);
   }
 
   // 2. description: present + non-empty
@@ -126,7 +126,7 @@ function check(filePath) {
   // 4+5. execution_context @-refs resolve + no trailing prose
   const refs = extractExecutionContextRefs(content);
   for (const { token, normalized, trailingProse } of refs) {
-    const absPath = path.join(GSD_ROOT, normalized);
+    const absPath = path.join(MSD_ROOT, normalized);
     if (!fs.existsSync(absPath)) {
       violations.push(`execution_context: @-ref "${normalized}" does not exist on disk`);
     }
@@ -182,7 +182,7 @@ function main() {
       `\nERROR lint-command-contract: ${unreachable.length} unreachable workflow file(s) of ${workflowCount}\n\n`,
     );
     for (const p of unreachable) {
-      process.stderr.write(`  gsd-core/${p}\n`);
+      process.stderr.write(`  msd-core/${p}\n`);
     }
     process.stderr.write(
       '\nEach file above ships to every runtime but is never referenced by any command,\n' +