fix(subagent-session-spawning): resolved subagent parent id propagation

- Forwarded `parentAgentId` through task and eval launch paths when spawning subagents.
- Mapped `parentAgentId` to `parentId` in `createAgentSession`.
- Passed each caller's session `getAgentId` (or `MAIN_AGENT_ID`) as the parent for spawned agents.

biome.json

@@ -9,7 +9,7 @@
 		"enabled": true,
 		"includes": ["**"],
 		"rules": {
-			"recommended": true,
+			"preset": "recommended",
 			"a11y": "off",
 			"correctness": {
 				"noUnusedImports": "error",