docs(spec): unified agent panel 2c implementation plan

[BunsDev]

Description

Docs-only. The 2c implementation plan for the unified agent panel — specs/castcodes-unified-agent-panel/PLAN-2c.md. Continues the Phase 2 design (#204); builds on 2a (#205) + 2b (#206).

2c scope: route the panel composer by conversation backend — CLI → terminal PTY (2b), Coven daemon → cast_agent stream_agent_events streamed into the same transcript — and populate the list with live daemon sessions.

Two Phase-1/2 unknowns resolved by code survey and recorded in the plan:

• Stream-mode prompt delivery — already handled: launch_daemon_session carries the prompt in the POST /api/v1/sessions launch body with launchMode:"stream"; no stdin user-frame needed. Each submit is one launch (session-per-turn); multi-turn context continuity is out of scope.
• Binding liveness (DESIGN Risk 2) — bind_live has no production caller (CLI auto-binds on first event); daemon conversations get a new ConversationBinding::LiveDaemon and a direct ChatModel::append_entry path (daemon events aren't CLIAgentEvents).

6 TDD tasks; the async stream consumer explicitly mirrors the shipped ai_assistant panel rather than inventing a warpui async primitive.

Linked Issue

Continues the reconciliation roadmap (design #204; 2a #205; 2b #206; Phase 1 #201). No separate tracking issue, per the #204 precedent.

Testing

• Docs-only. ./script/check_ai_attribution + ./script/check_rebrand pass.
• Not manually run with ./script/run (n/a — plan document).

Agent Mode

• CastCodes Agent Mode — PR via CastCodes. Join OpenCoven on Discord for support.

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