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.

examples/dynamic-context-management/README.md

@@ -5,7 +5,7 @@ Reference example for [ADR-1671](../../docs/adr/1671-dynamic-context-management-
 
 > **This is a non-shipping reference example.** It lives outside the build
 > (`src/` → `bin/lib/`), the npm package `files[]`, the installer, and the CI
-> test suite (`tests/`). Nothing here is compiled into or installed with GSD.
+> test suite (`tests/`). Nothing here is compiled into or installed with MSD.
 > The production implementation lands in a later phase of the
 > [Dynamic Context Management epic (#1671)](https://github.com/open-gsd/gsd-core/issues/1671).