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.

docs/features/phase-dependency-analysis.md

@@ -4,9 +4,9 @@ title: Phase Dependency Analysis
 group: v1.32 Features
 ---
 
-**Command:** `/gsd-manager --analyze-deps`
+**Command:** `/msd-manager --analyze-deps`
 
-**Purpose:** Detect phase dependencies and suggest `Depends on` entries for ROADMAP.md before running `/gsd-manager`.
+**Purpose:** Detect phase dependencies and suggest `Depends on` entries for ROADMAP.md before running `/msd-manager`.
 
 **Requirements:**
 - REQ-DEP-01: System MUST detect file overlap between phases