chore: v2.8.13 — Artifacts reinstall/edit/installs, agent steps in chat, pick a local file to attach, Windows paths as links

- Chat: an Agent step shows its task, status and tool calls and opens its conversation in place; Windows paths (E:\…, C:/…) in replies open as files
- Prompt: attach a file on this computer by path (native picker), clearer too-large messages
- Artifacts: edit title/description and a skill's files (new snapshot), Reinstall, install history, Hub-only rows, skills installed into ~/.claude/skills and ~/.agents/skills
- Files: batch upload of small files in one extract
- AI Tools: npm install falls back to --prefix ~/.local when the global prefix is not writable

server/openapi.js

@@ -393,6 +393,12 @@ function createOpenApiSpec() {
             name: { type: "string" },
             type: { type: "string", enum: ["main", "subagent", "compaction"] },
             subagent_type: { type: "string", nullable: true },
+            tool_use_id: {
+              type: "string",
+              nullable: true,
+              description:
+                "The Agent/Task tool_use that launched this subagent, from its meta file (Claude Code subagents only).",
+            },
             has_transcript: { type: "boolean" },
             db_agent_id: {
               type: "string",