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.

vscode/package.json

@@ -1,7 +1,7 @@
 {
-  "name": "gsd-core-vscode",
-  "displayName": "GSD Core",
-  "description": "GSD orchestration engine embedded in VS Code (ADR-1239 IDE profile).",
+  "name": "msd-core-vscode",
+  "displayName": "MSD Core",
+  "description": "MSD orchestration engine embedded in VS Code (ADR-1239 IDE profile).",
   "version": "1.14.0",
   "publisher": "opengsd",
   "engines": {
@@ -11,37 +11,37 @@
     "Other"
   ],
   "activationEvents": [
-    "onCommand:gsd.invoke"
+    "onCommand:msd.invoke"
   ],
   "main": "./extension.js",
   "browser": "./browser.js",
   "contributes": {
     "commands": [
       {
-        "command": "gsd.invoke",
-        "title": "GSD: Invoke Command"
+        "command": "msd.invoke",
+        "title": "MSD: Invoke Command"
       }
     ],
     "chatParticipants": [
       {
-        "id": "gsd",
-        "name": "gsd",
-        "fullName": "GSD Core",
-        "description": "Invoke GSD orchestration commands from chat.",
+        "id": "msd",
+        "name": "msd",
+        "fullName": "MSD Core",
+        "description": "Invoke MSD orchestration commands from chat.",
         "isSticky": true
       }
     ],
     "languageModelTools": [
       {
-        "name": "gsd_progress",
+        "name": "msd_progress",
         "tags": [
-          "gsd",
+          "msd",
           "status"
         ],
-        "toolReferenceName": "gsd-progress",
-        "displayName": "GSD Progress",
-        "modelDescription": "Reports GSD milestone/phase progress (percent complete, plan and summary counts) for the current project.",
-        "userDescription": "Check GSD project progress.",
+        "toolReferenceName": "msd-progress",
+        "displayName": "MSD Progress",
+        "modelDescription": "Reports MSD milestone/phase progress (percent complete, plan and summary counts) for the current project.",
+        "userDescription": "Check MSD project progress.",
         "canBeReferencedInPrompt": true,
         "inputSchema": {
           "type": "object",
@@ -50,15 +50,15 @@
         }
       },
       {
-        "name": "gsd_workstreams",
+        "name": "msd_workstreams",
         "tags": [
-          "gsd",
+          "msd",
           "status"
         ],
-        "toolReferenceName": "gsd-workstreams",
-        "displayName": "GSD Workstreams",
-        "modelDescription": "Lists the GSD parallel workstreams for the current project (or reports flat/single-workstream mode).",
-        "userDescription": "List GSD workstreams.",
+        "toolReferenceName": "msd-workstreams",
+        "displayName": "MSD Workstreams",
+        "modelDescription": "Lists the MSD parallel workstreams for the current project (or reports flat/single-workstream mode).",
+        "userDescription": "List MSD workstreams.",
         "canBeReferencedInPrompt": true,
         "inputSchema": {
           "type": "object",
@@ -67,22 +67,22 @@
         }
       },
       {
-        "name": "gsd_plan_phase",
+        "name": "msd_plan_phase",
         "tags": [
-          "gsd",
+          "msd",
           "plan"
         ],
-        "toolReferenceName": "gsd-plan-phase",
-        "displayName": "GSD Plan Phase",
-        "modelDescription": "Looks up the plan index (plans, waves, checkpoints) for a named GSD phase. Read-only — does not create or modify a phase plan; use the /gsd-plan-phase chat workflow for full phase planning.",
-        "userDescription": "Look up a GSD phase's plan index.",
+        "toolReferenceName": "msd-plan-phase",
+        "displayName": "MSD Plan Phase",
+        "modelDescription": "Looks up the plan index (plans, waves, checkpoints) for a named MSD phase. Read-only — does not create or modify a phase plan; use the /msd-plan-phase chat workflow for full phase planning.",
+        "userDescription": "Look up a MSD phase's plan index.",
         "canBeReferencedInPrompt": true,
         "inputSchema": {
           "type": "object",
           "properties": {
             "phase": {
               "type": "string",
-              "description": "The GSD phase name to look up (e.g. \"01-core\")."
+              "description": "The MSD phase name to look up (e.g. \"01-core\")."
             }
           },
           "required": [