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.

capabilities/pi/capability.json

@@ -3,11 +3,11 @@
   "role": "runtime",
   "version": "1.14.0",
   "title": "pi",
-  "description": "pi (pi.dev) — bun-runtime programmatic-CLI; TS ExtensionAPI (registerCommand/registerTool/registerProvider/pi.on); single native-extension file at ~/.pi/agent/extensions/gsd.js (.js, not .cjs — pi's extension auto-discovery accepts only .ts/.js, #2470); no shared-settings hook surface; tier-2 support.",
+  "description": "pi (pi.dev) — bun-runtime programmatic-CLI; TS ExtensionAPI (registerCommand/registerTool/registerProvider/pi.on); single native-extension file at ~/.pi/agent/extensions/msd.js (.js, not .cjs — pi's extension auto-discovery accepts only .ts/.js, #2470); no shared-settings hook surface; tier-2 support.",
   "tier": "core",
   "requires": [],
   "engines": {
-    "gsd": ">=1.7.0"
+    "msd": ">=1.7.0"
   },
   "runtime": {
     "configHome": {
@@ -60,11 +60,11 @@
     "hostBehaviors": {
       "nativePlugin": {
         "dir": "extensions",
-        "file": "gsd.js",
-        "source": "pi/gsd.cjs"
+        "file": "msd.js",
+        "source": "pi/msd.cjs"
       },
       "pluginOnlyInstall": true,
-      "sharedHooksDirName": "gsd-hooks"
+      "sharedHooksDirName": "msd-hooks"
     }
   }
 }