fix: resolve 25 pre-publish blockers

- postinstall.mjs: fix alias package detection
- migrate-legacy-plugin-entry: dedupe + regression tests
- task_system: default consistency across runtime paths
- task() contract: consistent tool behavior
- runtime model selection, tool cap, stale-task cancellation
- recovery sanitization, context-limit gating
- Ralph semantic DONE hardening, Atlas fallback persistence
- native-skill description/content, skill path traversal guard
- publish workflow: platform awaited via reusable workflow job
- release: version edits reapplied before commit/tag
- JSONC plugin migration: top-level plugin key safety
- cold-cache: user fallback models skip disconnected providers
- docs/version/release framing updates

Verified: bun test (4599 pass), tsc --noEmit clean, bun run build clean

src/plugin-config.test.ts

@@ -246,7 +246,13 @@ describe("parseConfigPartially", () => {
       const result = parseConfigPartially({});
 
       expect(result).not.toBeNull();
-      expect(Object.keys(result!).length).toBe(0);
+      expect(result).toEqual({
+        git_master: {
+          commit_footer: true,
+          include_co_authored_by: true,
+          git_env_prefix: "GIT_MASTER=1",
+        },
+      });
     });
   });