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.

.coderabbit.yaml

@@ -1,10 +1,10 @@
-# CodeRabbit configuration — open-gsd/gsd-core
+# CodeRabbit configuration — golem15com/msd-core
 #
 # Schema: https://docs.coderabbit.ai/reference/yaml-template/
 #
-# Project context: GSD ships a CLI tool + an agent runtime, not a documented
+# Project context: MSD ships a CLI tool + an agent runtime, not a documented
 # public library. We carry rich JSDoc on internal helpers that warrant it
-# (see bin/install.js, gsd-core/bin/lib/*.cjs) but we do not enforce a
+# (see bin/install.js, msd-core/bin/lib/*.cjs) but we do not enforce a
 # blanket docstring coverage bar — see issue #2932 for rationale.
 
 reviews: