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/pattern.test.cjs

@@ -3,12 +3,12 @@
 /**
  * Tests for `src/pattern.cts` — the pattern-construction seam (#3212 Phase 1, #3412).
  *
- * Design:       .gsd/phase/chore-3412-pattern-seam/40-design.md
- * Test matrix:  .gsd/phase/chore-3412-pattern-seam/50-test-matrix.md
+ * Design:       .msd/phase/chore-3412-pattern-seam/40-design.md
+ * Test matrix:  .msd/phase/chore-3412-pattern-seam/50-test-matrix.md
  * ADR:          docs/adr/3212-lexical-seam-consolidation.md §1, §2, §7
  *
  * TDD RED: `src/pattern.cts` does not exist yet — this file's
- * `require('../gsd-core/bin/lib/pattern.cjs')` throws MODULE_NOT_FOUND until
+ * `require('../msd-core/bin/lib/pattern.cjs')` throws MODULE_NOT_FOUND until
  * the implementing phase adds it. That is the intended starting state (mirrors
  * tests/planning-snapshot.test.cjs's RED convention).
  *
@@ -21,17 +21,17 @@ const assert = require('node:assert/strict');
 // Seeded fast-check convention: require the shared setup helper (NOT
 // 'fast-check' directly) so numRuns/seed are configured globally before any
 // fc.assert() call — mirrors tests/frontmatter.property.test.cjs and every
-// other *.property.test.cjs file. seed: 42, overridable via GSD_FC_SEED.
+// other *.property.test.cjs file. seed: 42, overridable via MSD_FC_SEED.
 const fc = require('./helpers/fast-check-setup.cjs');
 
-const { escapeRegex, literalPattern, compileUserPattern, MAX_USER_PATTERN_LEN } = require('../gsd-core/bin/lib/pattern.cjs');
+const { escapeRegex, literalPattern, compileUserPattern, MAX_USER_PATTERN_LEN } = require('../msd-core/bin/lib/pattern.cjs');
 
 /**
  * A single `node -e` inline probe script testing RegExp.escape fallback
  * semantics -- one subprocess, no fan-out. Coincides numerically with
- * tests/helpers/timeouts.cjs's GSD_TOOLS_CLI_MODERATE_TIMEOUT_MS but
+ * tests/helpers/timeouts.cjs's MSD_TOOLS_CLI_MODERATE_TIMEOUT_MS but
  * describes a different operation (an inline node -e probe, not a
- * gsd-tools.cjs CLI subcommand spawn) -- kept local.
+ * msd-tools.cjs CLI subcommand spawn) -- kept local.
  */
 const REGEXP_ESCAPE_PROBE_TIMEOUT_MS = 30_000;
 
@@ -215,7 +215,7 @@ describe('migration equivalence (row-9 sweep)', () => {
 // ─── Section 4: #3498 — Node-22 fallback (no RegExp.escape) ─────────────────
 
 describe('escapeRegex without RegExp.escape (#3498 Node-22 fallback)', () => {
-  // `RegExp.escape` is ES2026 (first shipped in Node 24). The gsd-test matrix
+  // `RegExp.escape` is ES2026 (first shipped in Node 24). The msd-test matrix
   // runs a linux-node22 lane and the BUILD consumes this module
   // (scripts/gen-loop-host-contract.cjs), so the seam must work when the
   // builtin is absent. Simulated in a child process: neuter RegExp.escape
@@ -224,7 +224,7 @@ describe('escapeRegex without RegExp.escape (#3498 Node-22 fallback)', () => {
   // between builtin and fallback; match behavior must not).
   const { runNode, OUTCOME } = require('./helpers/process-seam.cjs');
   const path = require('node:path');
-  const LIB = path.join(__dirname, '..', 'gsd-core', 'bin', 'lib', 'pattern.cjs');
+  const LIB = path.join(__dirname, '..', 'msd-core', 'bin', 'lib', 'pattern.cjs');
 
   const PROBE = [
     "RegExp.escape = undefined;",