Closes the dormancy gap: an agent no longer needs to be told "call agenthub_work".
`agenthub agent setup --agent <name> --role <role>` writes a verified Claude Code
SessionStart hook (.claude/settings.json) whose command runs `agenthub hook-context`,
which prints the work-loop instruction injected into every new session — so the
agent claims tasks AND surfaces messages from the first turn, no manual trigger.
- agentSetup.ts: agentSetup() (idempotent hook write, project or --user scope) +
hookContext() (the injected instruction).
- Honest limit (per Claude Code docs): SessionStart context is a strong nudge the
model reads, not a hard directive; the guide reinforces it. Can't block startup.
- Codex/Kimi aren't Claude Code — their guide already nudges agenthub_work first.
Run once per agent machine. Bump 0.8.1 -> 0.9.0.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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