fix(agents): a claude leftover behind a link still selects claude for its residual (Issue #31, review)

has_artifacts counted only the paths a purge may remove. When all that was
left lay behind a linked dir, `purge claude <uuid>` (or auto) found no
adapter and exited 5 with an empty residual, hiding the path the purge
had refused to follow. has_artifacts now counts every candidate; _inside
still decides what is removed, so the CLI exits 0, removes nothing and
lists the linked path as residual.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib_py/agents/adapters/claude.py

@@ -344,8 +344,10 @@ class ClaudeAgentAdapter(BaseAgentAdapter):
         return [p for root, p in self._candidates(uuid, ctx) if _inside(root, p)]
 
     def has_artifacts(self, uuid: str, ctx: DiscoveryContext) -> bool:
-        # Leftovers count without the transcript (a pre-#31 purge left them).
-        return bool(self._owned_paths(uuid, ctx))
+        # Leftovers count without the transcript (a pre-#31 purge left them),
+        # and so does one behind a link: the purge keeps it, but picking
+        # claude is what gets it reported as residual.
+        return bool(self._candidates(uuid, ctx))
 
     def conversation_in_use(self, uuid: str, ctx: DiscoveryContext) -> bool:
         # No claude process holds a name that is not a uuid; searching