Agent abstraction Phase D: polish (optional)

[dhilgaertner]

Summary

Optional polish on top of the Phase A–C agent-abstraction work scoped by #150. Not blocking for Codex MVP; revisit once Phases A–C are landed and real usage surfaces priorities.

Context

Full design in docs/agent-abstraction-spec.md §12 Phase D.

Each checkbox below is individually optional. Treat this ticket as an umbrella — subtickets can be split off as items move from "nice-to-have" to "yes, do this."

Checklist

• Per-agent notification sounds and sidebar icons (Claude vs Codex vs future agents)
• Third-party agent plug-in surface (external packages conform to CodingAgent; discovered at launch)
• Config-path migration: move {devRoot}/.claude/config.json → {devRoot}/.crow/config.json with one-shot migration on first launch (legacy path name is currently Crow's own config, not Claude Code's)
• Codex remote control via WebSocket through codex app-server --listen + --remote ws://…, if user demand warrants it

Non-goals

• Claude-Code remote-control changes (stays as --rc --name)
• Manager-tab agent swapping (explicitly out of scope per spec §14)

Parent: #150 · Blocked by: #168 (Phase C)