Map subagent tools to spawn_agent for Codex collab support

[Copilot]

Updates Codex tool mapping to support subagent workflows via spawn_agent + wait when collaboration mode is enabled, with sequential fallback when disabled.

Changes

.codex/superpowers-bootstrap.md

• Updated Task tool mapping: now uses spawn_agent + wait (collab) or sequential execution (non-collab), replacing previous "subagents aren't available" message
• Added Subagent / Agent tool mapping: directs to spawn_agent (collab) or sequential fallback

- `Task` tool with subagents → Tell the user that subagents aren't available in Codex yet and you'll do the work the subagent would do
+ `Task` tool with subagents → Use Codex collab `spawn_agent` + `wait` when available; if collab is disabled, state that and proceed sequentially
+ `Subagent` / `Agent` tool mentions → Map to `spawn_agent` (collab) or sequential fallback when collab is disabled

Ref: obra@e1080d1

Original prompt

Reference: obra@e1080d1

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