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/command-contract-helpers.cjs

@@ -2,7 +2,7 @@
 /**
  * command-contract-helpers.cjs  (ADR-0002)
  *
- * Single source of truth for the commands/gsd/*.md contract constants and
+ * Single source of truth for the commands/msd/*.md contract constants and
  * parsers shared by scripts/lint-command-contract.cjs and
  * tests/command-contract.test.cjs.
  *
@@ -54,7 +54,7 @@ function executionContextRefs(content) {
       const trailingProse = line.length > token.length;
       const normalized = token
         .replace(/^@(?:~|\$HOME)\//, '')
-        .replace(/^(?:\.claude\/)?(?:gsd-core\/)?/, '');
+        .replace(/^(?:\.claude\/)?(?:msd-core\/)?/, '');
       refs.push({ token, normalized, trailingProse });
     }
   }
@@ -64,7 +64,7 @@ function executionContextRefs(content) {
 /**
  * workflowPathRefs(content)
  *
- * Locates every gsd-core-relative workflow path referenced in a markdown
+ * Locates every msd-core-relative workflow path referenced in a markdown
  * string, whether the reference is an eager @-include (already covered by
  * executionContextRefs) or a *lazy* path mentioned only in prose/code — a
  * path a command reads on demand via Read/Bash rather than an @-inclusion
@@ -77,8 +77,8 @@ function executionContextRefs(content) {
  *
  *   A. Any path whose segments include `workflows/`, optionally preceded by
  *      an eager `@`, a home-dir prefix (`~/` or `$HOME/`), `.claude/`, and/or
- *      `gsd-core/` — e.g. `@~/.claude/gsd-core/workflows/scan.md`,
- *      `gsd-core/workflows/x.md`, or a bare `workflows/x.md`.
+ *      `msd-core/` — e.g. `@~/.claude/msd-core/workflows/scan.md`,
+ *      `msd-core/workflows/x.md`, or a bare `workflows/x.md`.
  *   B. Same as A but without the eager `@` — a lazy reference read on
  *      demand rather than inlined at load time.
  *   C. Parent-relative sub-file paths with no `workflows/` prefix at all —
@@ -105,14 +105,14 @@ function workflowPathRefs(content) {
     refs.push(normalized);
   }
 
-  const shapeARe = /@?(?:(?:~|\$HOME)\/)?(?:\.claude\/)?(?:gsd-core\/)?workflows\/[A-Za-z0-9._/-]+\.md(?![A-Za-z0-9_])/g;
+  const shapeARe = /@?(?:(?:~|\$HOME)\/)?(?:\.claude\/)?(?:msd-core\/)?workflows\/[A-Za-z0-9._/-]+\.md(?![A-Za-z0-9_])/g;
   let m;
   while ((m = shapeARe.exec(content)) !== null) {
     const normalized = m[0]
       .replace(/^@/, '')
       .replace(/^(?:~|\$HOME)\//, '')
       .replace(/^\.claude\//, '')
-      .replace(/^gsd-core\//, '');
+      .replace(/^msd-core\//, '');
     addRef(normalized);
   }
 
@@ -125,12 +125,12 @@ function workflowPathRefs(content) {
 }
 
 /**
- * unreachableWorkflows(loaderContents, gsdFiles, workflowPaths)
+ * unreachableWorkflows(loaderContents, msdFiles, workflowPaths)
  *
- * Computes reachability over the gsd-core file graph and reports which
+ * Computes reachability over the msd-core file graph and reports which
  * `workflowPaths` are never reached, starting only from `loaderContents`
  * (commands/agents/skills — the files a runtime actually loads) and walking
- * `workflowPathRefs` edges transitively through `gsdFiles`.
+ * `workflowPathRefs` edges transitively through `msdFiles`.
  *
  * The seed set is deliberately restricted to loaders and never includes a
  * workflow's own content. Seeding from workflows too would let two failure
@@ -143,7 +143,7 @@ function workflowPathRefs(content) {
  * mean "a runtime can actually get here," not merely "something points to
  * it."
  *
- * `gsdFiles` covers all of `gsd-core/**`, not just `workflows/`, because a
+ * `msdFiles` covers all of `msd-core/**`, not just `workflows/`, because a
  * `references/` or `templates/` file can itself name a workflow path and
  * needs to be walked through to propagate reachability — restricting the map
  * to `workflows/` would silently break any chain that passes through a
@@ -152,7 +152,7 @@ function workflowPathRefs(content) {
  * `visited` guards the walk against reference cycles (including the
  * mutual/self cases above) so traversal always terminates.
  */
-function unreachableWorkflows(loaderContents, gsdFiles, workflowPaths) {
+function unreachableWorkflows(loaderContents, msdFiles, workflowPaths) {
   const visited = new Set();
   const queue = [];
 
@@ -164,8 +164,8 @@ function unreachableWorkflows(loaderContents, gsdFiles, workflowPaths) {
     const p = queue.pop();
     if (visited.has(p)) continue;
     visited.add(p);
-    if (gsdFiles.has(p)) {
-      for (const ref of workflowPathRefs(gsdFiles.get(p))) queue.push(ref);
+    if (msdFiles.has(p)) {
+      for (const ref of workflowPathRefs(msdFiles.get(p))) queue.push(ref);
     }
   }
 
@@ -351,7 +351,7 @@ function extractMarkers(content, knownMarkers) {
  * parseAgentContracts(markdown)
  *
  * Parses the `## Agent Registry` pipe table in
- * gsd-core/references/agent-contracts.md into structured rows, keyed by
+ * msd-core/references/agent-contracts.md into structured rows, keyed by
  * lowercased, underscore-joined column headers (`Completion Markers` ->
  * `completion_markers`). Column set is read from the header row itself, so
  * the table can grow a `Consumed By` / `Kind` column later without this
@@ -703,7 +703,7 @@ function contractViolations({ registry, producerMarkers, candidateMarkers, consu
  * prose — so every backtick span is inspected and only tokens that look like
  * repo-relative markdown paths (`^[\w][\w./-]*\.md$` — no spaces, no glob
  * stars) are returned. A glob (`*-VERIFICATION.md`) or a command
- * (`gsd_run query verification.status`) describes the consumption mechanism
+ * (`msd_run query verification.status`) describes the consumption mechanism
  * in prose; it is not a file the check can open, and is ignored.
  */
 function parseConsumedByCell(value) {
@@ -797,8 +797,8 @@ function readTagViolations({ registry, agentTexts, consumerTexts } = {}) {
  * silently.
  */
 const NON_AGENT_TOKENS = new Set([
-  // Display headings the /gsd:graphify command itself renders from
-  // `gsd_run graphify build` CLI output — tool output shown to the user,
+  // Display headings the /msd:graphify command itself renders from
+  // `msd_run graphify build` CLI output — tool output shown to the user,
   // not an agent return any spawner dispatches on.
   'GRAPHIFY BUILD COMPLETE',
   'GRAPHIFY BUILD FAILED',
@@ -831,7 +831,7 @@ function unmatchedConsumerTokens({ consumerTexts, vocabulary } = {}) {
 
     const reported = new Set();
     for (const [file, text] of consumers.entries()) {
-      if (!file.startsWith('gsd-core/workflows/') && !file.startsWith('commands/')) continue;
+      if (!file.startsWith('msd-core/workflows/') && !file.startsWith('commands/')) continue;
       if (typeof text !== 'string') continue;
       tokenRe.lastIndex = 0;
       let m;
@@ -898,7 +898,7 @@ const VIOLATION_KINDS = Object.freeze({
  * new kind cannot ship without its remedy.
  */
 const REMEDIES = Object.freeze({
-  parse_error: 'fix the malformed row in gsd-core/references/agent-contracts.md',
+  parse_error: 'fix the malformed row in msd-core/references/agent-contracts.md',
   unclosed_fence: 'close the unterminated code fence in this agent file',
   declared_marker_not_emitted:
     'remove the marker from the registry row, or emit it as an in-fence example in the agent file',