Subagent table shows ids instead of task descriptions (Agent vs Task rename) #16

Part of #2. The subagent table shows raw ids (aef1ba54…) instead of task descriptions.

Investigation (evidence)

src/main/utils/toolExtraction.ts:20 hardcodes const isTask = block.name === 'Task';. Newer Claude Code renamed the tool: the current session has 11 tool_use blocks named "Agent" and 0 named "Task". So getTaskCalls() returns nothing → SubagentResolver.linkToTaskCalls links nothing → Process.description stays undefined → the CLI prints bare ids.

Proposed fix

One line in src/main/utils/toolExtraction.ts: const isTask = block.name === 'Task' || block.name === 'Agent';

This is a shared file — the Electron app benefits too (its task-filtering has the same blind spot for Agent-named calls). Consumers checked: ProcessLinker.ts:27 (subagent linking — exactly what we want fixed), jsonl.ts getTaskCalls, renderer displayItemBuilder.ts uses its own call.name === 'Task' checks (line 518) — those stay as-is for now (separate concern, note in PR).

Estimate: S (~15 LOC incl. test for an Agent-named call extracting taskDescription).