fix(x): skill catalog advertises the post-reorg path; legacy path stays an alias

The bundled-skill CATALOG_PREFIX still pointed at the deleted
src/application/assistant/skills tree, so the system prompt and the
loadSkill example advertised paths that no longer exist — while the
real post-reorg path (src/runtime/assembly/skills) was NOT a
resolvable alias, so a model referencing the actual source tree got
'Skill not found'.

The new path is now canonical in the catalog and tool description;
the old prefix is kept as a loadSkill alias because agent snapshots
baked before the reorg still carry it. Regression test pins both.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/x/packages/core/src/runtime/assembly/skills/index.test.ts

@@ -103,7 +103,7 @@ describe("skills index (disk skill merge layer)", () => {
     const skills = await loadSkillsIndex();
 
     const resolved = skills.resolveSkill("meeting-prep");
-    expect(resolved?.catalogPath).toBe("src/application/assistant/skills/meeting-prep/skill.ts");
+    expect(resolved?.catalogPath).toBe("src/runtime/assembly/skills/meeting-prep/skill.ts");
     expect(resolved?.content).not.toContain("DISK CONTENT MARKER");
 
     const catalog = skills.buildSkillCatalog();
@@ -178,7 +178,7 @@ describe("capability activation boundary", () => {
       summary: "a genuine model-activated skill",
       content: "guidance",
       tools: ["file-readText"],
-      catalogPath: "src/application/assistant/skills/real-skill/skill.ts",
+      catalogPath: "src/runtime/assembly/skills/real-skill/skill.ts",
     };
     const mixed = [model, eager];
 
@@ -199,6 +199,18 @@ describe("capability activation boundary", () => {
       expect(catalog).toContain(id);
     }
   });
+
+  it("resolves bundled skills by the advertised path and by the pre-reorg legacy path", async () => {
+    // The catalog advertises the post-reorg source path; agent snapshots baked
+    // before the move still reference the old application/assistant prefix.
+    // Both must resolve to the same skill.
+    const { resolveSkill } = await loadSkillsIndex();
+    const advertised = resolveSkill("src/runtime/assembly/skills/meeting-prep/skill.ts");
+    const legacy = resolveSkill("src/application/assistant/skills/meeting-prep/skill.ts");
+    expect(advertised?.id).toBe("meeting-prep");
+    expect(legacy?.id).toBe("meeting-prep");
+    expect(legacy?.content).toBe(advertised?.content);
+  });
 });
 
 describe("availability (catalog visibility)", () => {

apps/x/packages/core/src/runtime/assembly/skills/index.ts

@@ -31,7 +31,10 @@ import appsSkill from "./apps/skill.js";
 import slackSkill from "./slack/skill.js";
 
 const CURRENT_DIR = path.dirname(fileURLToPath(import.meta.url));
-const CATALOG_PREFIX = "src/application/assistant/skills";
+const CATALOG_PREFIX = "src/runtime/assembly/skills";
+// Pre-reorg home of the bundled skills. Agent snapshots baked before the move
+// carry loadSkill references under this prefix, so it stays a resolvable alias.
+const LEGACY_CATALOG_PREFIX = "src/application/assistant/skills";
 
 // console.log(liveNoteSkill);
 
@@ -355,6 +358,8 @@ for (const entry of bundledEntries) {
     `skills/${entry.id}/skill.js`,
     `${CATALOG_PREFIX}/${entry.id}/skill.ts`,
     `${CATALOG_PREFIX}/${entry.id}/skill.js`,
+    `${LEGACY_CATALOG_PREFIX}/${entry.id}/skill.ts`,
+    `${LEGACY_CATALOG_PREFIX}/${entry.id}/skill.js`,
     absoluteTs,
     absoluteJs,
   ];

apps/x/packages/core/src/runtime/tools/catalog.ts

@@ -39,7 +39,7 @@ export const BuiltinTools: z.infer<typeof BuiltinToolsSchema> = {
     loadSkill: {
         description: "Load a Rowboat skill definition into context by fetching its guidance string",
         inputSchema: z.object({
-            skillName: z.string().describe("Skill identifier or path (e.g., 'workflow-run-ops' or 'src/application/assistant/skills/workflow-run-ops/skill.ts')"),
+            skillName: z.string().describe("Skill identifier or path (e.g., 'workflow-run-ops' or 'src/runtime/assembly/skills/workflow-run-ops/skill.ts')"),
         }),
         execute: async ({ skillName }: { skillName: string }) => {
             const resolved = resolveSkill(skillName);