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/lint-allow-test-rule-refs.cjs

@@ -77,7 +77,7 @@
  * `local/no-source-grep` is registered by `eslint.config.mjs` on several
  * glob blocks, not only `tests/** /*.cjs`: also `scripts/** /*.cjs`,
  * `eslint-rules/** /*.cjs`, `bin/lib/** /*.cjs`, `pi/** /*.cjs`,
- * `examples/** /*.cjs`, `gsd-core/bin/** /*.cjs`, `vscode/*.js`,
+ * `examples/** /*.cjs`, `msd-core/bin/** /*.cjs`, `vscode/*.js`,
  * `.kilo/plugins/*.js`, and `.opencode/plugins/*.js`. A prior version of
  * this script only walked `tests/** /*.test.cjs`, which silently dropped
  * every non-`.test.cjs` file under `tests/` AND every file under every one
@@ -166,24 +166,24 @@ const noSourceGrepRule = require('../eslint-rules/no-source-grep.cjs');
 
 const ROOT = path.join(__dirname, '..');
 const ESLINT_CONFIG_PATH = path.join(ROOT, 'eslint.config.mjs');
-const TESTS_DIR = process.env.GSD_LINT_ALLOW_TEST_RULE_TESTS_DIR || path.join(ROOT, 'tests');
+const TESTS_DIR = process.env.MSD_LINT_ALLOW_TEST_RULE_TESTS_DIR || path.join(ROOT, 'tests');
 // Overrides the ROOT that non-`tests/` glob base directories (scripts/,
-// eslint-rules/, bin/lib/, pi/, examples/, gsd-core/bin/, vscode/,
+// eslint-rules/, bin/lib/, pi/, examples/, msd-core/bin/, vscode/,
 // .kilo/plugins/, .opencode/plugins/ — see deriveNoSourceGrepGlobs) are
 // resolved under. TESTS_DIR already has its own override (above) for the
 // `tests/**/*.cjs` block; this is the equivalent knob for every OTHER block
 // that registers `local/no-source-grep`, so sandbox fixtures can exercise
 // the widened scan scope (#3464 phase 5 BLOCKER fix) without the test suite
 // re-scanning this repo's real scripts/eslint-rules/etc. trees on every run.
-const EXTRA_ROOT = process.env.GSD_LINT_ALLOW_TEST_RULE_EXTRA_ROOT || ROOT;
+const EXTRA_ROOT = process.env.MSD_LINT_ALLOW_TEST_RULE_EXTRA_ROOT || ROOT;
 const ALLOWLIST_PATH =
-  process.env.GSD_LINT_ALLOW_TEST_RULE_ALLOWLIST ||
+  process.env.MSD_LINT_ALLOW_TEST_RULE_ALLOWLIST ||
   path.join(__dirname, 'lint-allow-test-rule-refs.allowlist.json');
 const EFFECTIVE_CEILING_PATH =
-  process.env.GSD_LINT_ALLOW_TEST_RULE_EFFECTIVE_CEILING ||
+  process.env.MSD_LINT_ALLOW_TEST_RULE_EFFECTIVE_CEILING ||
   path.join(__dirname, 'lint-allow-test-rule-refs.effective-ceiling.json');
 const UNVERIFIED_CEILING_PATH =
-  process.env.GSD_LINT_ALLOW_TEST_RULE_UNVERIFIED_CEILING ||
+  process.env.MSD_LINT_ALLOW_TEST_RULE_UNVERIFIED_CEILING ||
   path.join(__dirname, 'lint-allow-test-rule-refs.unverified-ceiling.json');
 
 /** Matches a compliant issue reference or URL */
@@ -247,7 +247,7 @@ function extractGenuineMarkerReasons(allComments) {
  * (`tests/helpers/**`, `tests/qa/**`, `tests/fixtures/**`, ...) AND every one
  * of the other config blocks the rule is registered on (`scripts/** /*.cjs`,
  * `eslint-rules/** /*.cjs`, `bin/lib/** /*.cjs`, `pi/** /*.cjs`,
- * `examples/** /*.cjs`, `gsd-core/bin/** /*.cjs`, `vscode/*.js`,
+ * `examples/** /*.cjs`, `msd-core/bin/** /*.cjs`, `vscode/*.js`,
  * `.kilo/plugins/*.js`, `.opencode/plugins/*.js`). A marker in any of those
  * would vanish from BOTH reported numbers instead of tripping anything.
  *
@@ -365,9 +365,9 @@ function globToRegExp(glob) {
  *
  * Each glob's literal base directory (`globBaseDir`) is resolved to an
  * actual directory on disk: the `tests` base uses `testsDir` (the existing
- * `GSD_LINT_ALLOW_TEST_RULE_TESTS_DIR` override contract, unchanged), every
+ * `MSD_LINT_ALLOW_TEST_RULE_TESTS_DIR` override contract, unchanged), every
  * other base is resolved under `extraRoot` (defaults to `ROOT`, overridable
- * via `GSD_LINT_ALLOW_TEST_RULE_EXTRA_ROOT` so sandbox fixtures can exercise
+ * via `MSD_LINT_ALLOW_TEST_RULE_EXTRA_ROOT` so sandbox fixtures can exercise
  * the widened scan scope in isolation). Matching itself is always done
  * against the glob's own repo-relative path string (e.g. `tests/foo.cjs`,
  * `scripts/bar.cjs`), never against the physical scan location, so a