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/1235-descriptor-driven-agent-conversion-migration.md

@@ -42,14 +42,14 @@ The inline loop performs **ten** behaviors beyond raw copy (the issue listed sev
 |---|---|---|---|---|
 | a | Path-prefix rewrite (`~/.claude/` → `pathPrefix`) | 10154–10165 | all **except** copilot, antigravity (own rewrite) | cross-cutting |
 | b | `processAttribution(content, getCommitAttribution(runtime))` | 10166 | all | cross-cutting |
-| c | `normalizeAgentBodyForRuntime` (colon→hyphen `/gsd:` refs) | 10240 | claude, qwen, hermes | cross-cutting (gated set) |
+| c | `normalizeAgentBodyForRuntime` (colon→hyphen `/msd:` refs) | 10240 | claude, qwen, hermes | cross-cutting (gated set) |
 | d | Claude `effort:` + `disallowedTools:` frontmatter injection | 10225–10232 | claude only | runtime-specific (needs agentName + targetDir) |
 | e | Copilot `.agent.md` filename rename | 10241 | copilot only | runtime-specific (file-level, not content) |
 | f | `isGlobal` scope arg to the converter | 10194–10196 | copilot, antigravity | runtime-specific (needs scope) |
 | g | OpenCode per-agent model-override read + inject | 10168–10186 | opencode only | runtime-specific (needs agentName + targetDir) |
 | h | Qwen/Hermes branding swaps (`Claude Code`/`.claude/`/`CLAUDE.md`) | 10210–10217 | qwen, hermes | runtime-specific — **no converter function exists today** |
 | i | Codex `.toml` sidecar (reads model override + effort; emits `model_reasoning_effort` **only when a model is pinned**) | ~5730–5750, ~3167 | codex only | separate third path |
-| j | Stale-agent cleanup: remove pre-existing `agents/gsd-*` before (re)install; minimal-mode Codex strips stale `[agents.gsd-*]` TOML (the full→minimal shrink) | ~10111, ~10126 | all (file cleanup); codex (toml) | cross-cutting pre-step |
+| j | Stale-agent cleanup: remove pre-existing `agents/msd-*` before (re)install; minimal-mode Codex strips stale `[agents.msd-*]` TOML (the full→minimal shrink) | ~10111, ~10126 | all (file cleanup); codex (toml) | cross-cutting pre-step |
 
 ### Converter-context contract
 
@@ -57,7 +57,7 @@ Today the extracted converters (`src/runtime-artifact-conversion.cts`) are `(con
 
 ```
 AgentConverterContext = {
-  agentName: string;      // 'gsd-planner' — for effort, disallowedTools, model overrides
+  agentName: string;      // 'msd-planner' — for effort, disallowedTools, model overrides
   runtime: string;        // for attribution + normalization predicate
   isGlobal: boolean;      // copilot/antigravity scope selection
   targetDir: string;      // to read effort/model-override/attribution user config
@@ -72,7 +72,7 @@ Cross-cutting steps (a, b, c) are applied by the descriptor pipeline for the app
 
 ## Incremental cutover plan (each step gated on golden parity)
 
-0. **Parity harness** — capture, per runtime, the inline loop's installed agent files as golden fixtures **for both full and minimal mode** (so the full→minimal shrink and stale-agent cleanup, behavior j, are covered), and add a test asserting the descriptor path's staged+converted output is byte-identical — including that re-installing over a stale `agents/gsd-*` set converges to the same result. This is the gate every subsequent step must pass.
+0. **Parity harness** — capture, per runtime, the inline loop's installed agent files as golden fixtures **for both full and minimal mode** (so the full→minimal shrink and stale-agent cleanup, behavior j, are covered), and add a test asserting the descriptor path's staged+converted output is byte-identical — including that re-installing over a stale `agents/msd-*` set converges to the same result. This is the gate every subsequent step must pass.
 1. **Trivial converters** (cursor, windsurf, augment, trae, codebuddy, cline) — single-arg converters; need only cross-cutting steps + the existing converter. Lowest risk; proves the split.
 2. **Scope-aware** (copilot, antigravity) — thread `isGlobal`; copilot also needs the `.agent.md` rename (a descriptor file-name transform).
 3. **Config-reading** (opencode model override; claude effort/disallowedTools) — resolve via context at the descriptor boundary.
@@ -84,7 +84,7 @@ Cross-cutting steps (a, b, c) are applied by the descriptor pipeline for the app
 
 - **Step 0 (parity harness):** shipped in `tests/golden-parity-single-source.test.cjs` (folded as `folded:issue-1575-agent-descriptor-parity` in the #3336 test-hygiene sweep). Asserts `applySurface` output is byte-identical to `installRuntimeArtifacts` for all descriptor-driven runtimes. Covers stale-cleanup convergence (pre-existing legacy `.agent.md` pruned correctly).
 - **Step 1 (trivial converters):** cursor, windsurf, augment, trae, codebuddy — install-path cutover complete (PR #1438); surface-path parity shipped (#1575: `applySurface` now builds `agentCtx` and passes it to `kind.stage()` for agents, applying path-rewrite + attribution + converter + normalize).
-- **Step 2 (scope-aware):** copilot and antigravity — cutover complete (#1575: declared `agents` kind in `capability.json`, added to `_DESCRIPTOR_AGENTS_RUNTIMES`, copilot `.agent.md` rename handled in both `_copyStaged` and `_syncGsdDir`).
+- **Step 2 (scope-aware):** copilot and antigravity — cutover complete (#1575: declared `agents` kind in `capability.json`, added to `_DESCRIPTOR_AGENTS_RUNTIMES`, copilot `.agent.md` rename handled in both `_copyStaged` and `_syncMsdDir`).
 - **Cline:** deferred — rules-only local branch + local/global complication not handled by the descriptor-driven path.
 - **Remaining:** steps 3–6 (config-reading, no-converter, codex, inline-loop deletion).