[idea] Native Command Code agent support

[udirom]

Feature request

Add native Command Code (command-code) agent detection and session-restore integration to Herdr.

What

Command Code is a CLI coding agent. Adding native support would give it:

• Automatic detection (idle, working, blocked) via screen manifest
• Session identity reporting through its SessionStart hook
• Native session restore via command-code --resume <id>

Why

Command Code is a growing CLI coding agent. Native Herdr support would let users run Command Code alongside other agents with proper status detection and session restore.

Implementation

PR #3332 is ready for review with full implementation following the established pattern from previous agent additions (Grok, Antigravity CLI, Cursor, Maki, Muse).

Changes:

• Detection: Agent::CommandCode enum variant, SCREEN_MANIFEST_AGENTS, label/executable/lookup mappings
• Screen manifest: command-code.toml with idle (prompt), working (braille spinner), blocked (permission prompt) rules
• Integration: session-only hook reports SessionStart for session identity, no lifecycle authority
• Resume: command-code --resume <id> via agent_resume::plan
• Sound overrides: command_code field in AgentSoundOverrides
• Website: manifest mirror + index entry
• Docs: docs/next/ updates for integrations, agents, session-state, cli-reference, changelog

All CI checks pass. Review feedback from CodeRabbit and Greptile has been addressed.

[Chuang877]

Confirming the same gap on Herdr 0.8.2 (stable) + Command Code 1.37.0 (cmd on PATH, macOS arm64).

• herdr integration install has no cmd / command-code target
• a pane running cmd stays a generic terminal (herdr agent list never lists it)
• herdr agent start --kind also has no Command Code kind

A third-party plugin can paper over hooks, but it is not first-class detection or restore. Please add official process detection + herdr integration install for Command Code, same as Claude / Codex / OpenCode / Grok.