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.

tests/readfilesync-trace-parity.test.cjs

@@ -3,7 +3,7 @@
 /**
  * readfilesync-trace-parity.test.cjs
  *
- * Row 14 of .gsd/phase/chore-3415-prohibition-with-teeth/50-test-matrix.md:
+ * Row 14 of .msd/phase/chore-3415-prohibition-with-teeth/50-test-matrix.md:
  * `no-crlf-fragile-split.cjs` and `no-unbounded-quantifier.cjs` both import
  * their readFileSync-derivation data-flow tracing from the shared
  * `eslint-rules/lib/readfilesync-trace.cjs` module (extracted from