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/adr/1508-runtime-artifact-conversion-module.md

@@ -6,7 +6,7 @@
 - **Epic:** #1507
 - **Implementation:** Phase 1 (helper relocation, no behavior change) → Phase 2 (engine move + relay deletion)
 
-The **Runtime Surface Module** (`src/surface.cts` → `surface.cjs`) re-materializes a resolved skill surface to disk via `applySurface`. For `skills` kinds it must rewrite staged `SKILL.md` bodies so their `@`-ref paths point at the install target (`pathPrefix`) instead of the converter's default `~/.claude` paths (#813). To do that it reaches **up** into the 12,289-line hand-authored `bin/install.js` via `getInstallExports()` (`src/runtime-artifact-layout.cts:53-69`) — a lazy `require('../../../bin/install.js')` guarded by a save/set/restore of `GSD_TEST_MODE` — to borrow `computePathPrefix` and `applyRuntimeContentRewritesInPlace`.
+The **Runtime Surface Module** (`src/surface.cts` → `surface.cjs`) re-materializes a resolved skill surface to disk via `applySurface`. For `skills` kinds it must rewrite staged `SKILL.md` bodies so their `@`-ref paths point at the install target (`pathPrefix`) instead of the converter's default `~/.claude` paths (#813). To do that it reaches **up** into the 12,289-line hand-authored `bin/install.js` via `getInstallExports()` (`src/runtime-artifact-layout.cts:53-69`) — a lazy `require('../../../bin/install.js')` guarded by a save/set/restore of `MSD_TEST_MODE` — to borrow `computePathPrefix` and `applyRuntimeContentRewritesInPlace`.
 
 This is the **last upward dependency from the `.cts` source tree into the hand-authored installer**. It forces an env-var dance at a test seam, and it leaks: `applySurface` (and `bin/install.js`'s own three call sites) each re-derive the same five path-prefix inputs (`scope→isGlobal`, `runtime==='opencode'`, `process.platform`, normalized `resolvedTarget`, normalized `homeDir`) before calling `computePathPrefix`. The prefix-derivation knowledge is duplicated across `surface.cts` and `install.js`.
 
@@ -23,7 +23,7 @@ This is the **last upward dependency from the `.cts` source tree into the hand-a
 - **Dependency direction:** `bin/install.js` and `runtime-artifact-layout.cts` import the conversion module; the conversion module imports **nothing upward** (not `install.js`, not `layout`) — only deeper leaves.
 - `getDirName(runtime)` relocates to `src/runtime-name-policy.cts` (a clean `fs`/`path`-only leaf), so the conversion module can consume it **without** dragging in `capability-registry.cjs` (which `runtime-homes.cjs` requires). `processAttribution` / `getCommitAttribution` move **into** the conversion module (attribution is content transformation).
 - The duplicate `convertClaudeToAugmentMarkdown` (verified **byte-identical** in `install.js:2584` and `conversion.cts:976`) collapses to the conversion-module copy; `install.js`'s local copy is deleted (it already re-exports `...runtimeArtifactConversion`).
-- `getInstallExports` / `loadInstallExports` / the `InstallExports` interface **and the `GSD_TEST_MODE` require of `bin/install.js`** are deleted from `runtime-artifact-layout.cts`. `surface.cts` (the sole consumer) calls the conversion module's deep functions directly — removing the last upward `.cts → install.js` dependency.
+- `getInstallExports` / `loadInstallExports` / the `InstallExports` interface **and the `MSD_TEST_MODE` require of `bin/install.js`** are deleted from `runtime-artifact-layout.cts`. `surface.cts` (the sole consumer) calls the conversion module's deep functions directly — removing the last upward `.cts → install.js` dependency.
 
 ## Initial Scope
 
@@ -37,7 +37,7 @@ This is the **last upward dependency from the `.cts` source tree into the hand-a
 1. Move `_applyRuntimeRewrites`, `applyRuntimeContentRewritesInPlace`, `applyRuntimeContentRewritesForCommandsInPlace`, and `computePathPrefix` into `conversion.cts`.
 2. Expose `rewriteStagedSkillBodies` / `rewriteStagedCommandBodies`; privatize `computePathPrefix` (`_computePathPrefix` for tests).
 3. `surface.cts:applySurface` and `install.js`'s three internal sites (`7261`/`7276`, `9475`) call the deep functions; delete the per-site prefix derivation.
-4. Delete `getInstallExports` / `loadInstallExports` / `InstallExports` + the `GSD_TEST_MODE` `bin/install.js` require from `runtime-artifact-layout.cts`.
+4. Delete `getInstallExports` / `loadInstallExports` / `InstallExports` + the `MSD_TEST_MODE` `bin/install.js` require from `runtime-artifact-layout.cts`.
 5. Tests: `fast-check` property test for the rewrite engine (`$HOME`-collapse invariant; path-rewrite idempotency), direct `_computePathPrefix` unit tests, delete the `path-replacement.test.cjs` reimplementation, and a `DEFECT.GENERATIVE-FIX` parity guard ensuring no second converter copy reappears.
 
 ### These phases should NOT
@@ -66,7 +66,7 @@ This is the **last upward dependency from the `.cts` source tree into the hand-a
 ## Consequences
 
 - **+** `surface.cts` and `install.js` stop re-deriving the path prefix — one owner, leak dissolved at both sites.
-- **+** The `.cts` source tree no longer reaches into hand-authored `bin/install.js`; `runtime-artifact-layout.cts` no longer requires `install.js` or toggles `GSD_TEST_MODE`.
+- **+** The `.cts` source tree no longer reaches into hand-authored `bin/install.js`; `runtime-artifact-layout.cts` no longer requires `install.js` or toggles `MSD_TEST_MODE`.
 - **+** `computePathPrefix` gains real unit + property coverage it lacks today.
 - **−** `bin/install.js` stays hand-authored JS; it now imports the rewrite engine back from the generated `conversion.cjs` — the same pattern it already uses for `hooksSurface` and `...runtimeArtifactConversion`. Only the moved functions become TypeScript; `install.js` itself is not converted.
 - **−** Two-phase sequence; CONTEXT.md glossary, ADR README index, and `lint:ci` (ADR-HEADER) updates required at merge.
@@ -84,7 +84,7 @@ The decision recorded above is **implemented** on `next`. The ADR `Status` stays
 
 Landed:
 - **Phase 1 (#1512):** `getDirName` → `src/runtime-name-policy.cts`; `processAttribution` → `src/runtime-artifact-conversion.cts`. (`getCommitAttribution` stays in `bin/install.js` — a documented scope refinement: it is impure install-time config I/O, not a content-transformation helper, so it cannot move into the pure conversion module. Phase 2 injects the resolved attribution value instead.)
-- **Phase 2 (#1513):** the content-rewrite engine (`_applyRuntimeRewrites`), both staged-content walkers, and `computePathPrefix` (private; `_computePathPrefix` for tests) live in `src/runtime-artifact-conversion.cts` behind the deep seam `rewriteStagedSkillBodies` / `rewriteStagedCommandBodies({runtime, configDir, scope, homedir?, platform?, resolveAttribution?})`. The `getInstallExports` / `loadInstallExports` / `InstallExports` relay and the `GSD_TEST_MODE` install.js `require` are **deleted** from `src/runtime-artifact-layout.cts` — the last upward `.cts → bin/install.js` dependency is gone. `CONTEXT.md` marks the module **SHIPPED**. (The install-side cutover lands one indirection deeper than the literal issue text — `install.js` delegates to `createRuntimeArtifactInstallPlan`, which performs the deep calls in `src/runtime-artifact-install-plan.cts` — satisfying the same dependency-direction intent with a cleaner owner.)
+- **Phase 2 (#1513):** the content-rewrite engine (`_applyRuntimeRewrites`), both staged-content walkers, and `computePathPrefix` (private; `_computePathPrefix` for tests) live in `src/runtime-artifact-conversion.cts` behind the deep seam `rewriteStagedSkillBodies` / `rewriteStagedCommandBodies({runtime, configDir, scope, homedir?, platform?, resolveAttribution?})`. The `getInstallExports` / `loadInstallExports` / `InstallExports` relay and the `MSD_TEST_MODE` install.js `require` are **deleted** from `src/runtime-artifact-layout.cts` — the last upward `.cts → bin/install.js` dependency is gone. `CONTEXT.md` marks the module **SHIPPED**. (The install-side cutover lands one indirection deeper than the literal issue text — `install.js` delegates to `createRuntimeArtifactInstallPlan`, which performs the deep calls in `src/runtime-artifact-install-plan.cts` — satisfying the same dependency-direction intent with a cleaner owner.)
 
 Two deferred follow-ups were spun out as **sub-issues of #1507** and have since been **delivered** (neither was a blocker; the architectural goal — single ownership, downward dependency direction, relay deletion — was already met by the merged slices above):
 - **#1675** (PR #1685) — deduped the byte-identical `convertClaudeToAugmentMarkdown` / `convertSlashCommandsToAugmentSkillMentions` between `bin/install.js` and the conversion module (the Phase 1 → Phase 2 deferred cleanup; install.js now binds them from the conversion module, single-sourced).