feat(lanes): surface child worktrees on a lane card + detect Superpowers skills

Adopting the main repo as its own lane now gets stage detection
(cwd matches, same as any other lane), and its card lists every
managed-worktree lane provisioned from it with a jump-to link.
Also add the two missing Skill-tool detect rules (implement, ship)
so detection covers all four Superpowers workflow phases, not just
plan/review.

client/src/lib/types.ts

@@ -2319,6 +2319,9 @@ export interface Lane {
   cwd: string;
   branch: string | null;
   kind: "managed" | "adopted";
+  /** For a managed worktree lane, the repo it was provisioned from. Null for
+   *  an adopted lane (it IS a source repo, not a worktree of one). */
+  source_repo: string | null;
   pipeline: string;
   session_id: string | null;
   run_id: string | null;