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.

scripts/baselines/planning-prompt-drift-baseline.json

@@ -1,4 +1,4 @@
 {
-  "$comment": "ADR-3180 Decision 4(e) ratchet, owned by Phase 8 (#3218). See scripts/lint-planning-prompt-drift.cjs. SHRINK-ONLY: entries are removed as sites migrate to the gsd-core CLI; new or changed entries fail lint:ci. `count` is the number of byte-identical (file, text) occurrences acknowledged at this site — a run producing fewer fails as a partial migration, more fails as an unacknowledged new copy. Emptied by #3218: all 6 recorded sites (7 occurrences) migrated to `gsd_run query find-phase` — see gsd-core/workflows/{execute-plan,plan-phase,plan-review-convergence,progress}.md.",
+  "$comment": "ADR-3180 Decision 4(e) ratchet, owned by Phase 8 (#3218). See scripts/lint-planning-prompt-drift.cjs. SHRINK-ONLY: entries are removed as sites migrate to the msd-core CLI; new or changed entries fail lint:ci. `count` is the number of byte-identical (file, text) occurrences acknowledged at this site — a run producing fewer fails as a partial migration, more fails as an unacknowledged new copy. Emptied by #3218: all 6 recorded sites (7 occurrences) migrated to `msd_run query find-phase` — see msd-core/workflows/{execute-plan,plan-phase,plan-review-convergence,progress}.md.",
   "entries": []
 }