Merge branch 'main' into fix/880

Resolves #880. Implements invitation protocol and cell spawning
for multi-agent mission orchestration.

scripts/lazarus.py:
- lazarus invite [agent] --mission [id] --repo [url] --role [role]
  Clones repo into mission cell, updates roster
- lazarus spawn --mission [id] --agent [name]
  Spawns agent with Level 1 isolation (HERMES_HOME in cell dir)
- lazarus status --mission [id]
  Shows mission roster and agent status
- lazarus roster --mission [id]
  Dumps full roster JSON

Roles: lead, write, read, audit
Isolation: directory-based (HERMES_HOME per agent)
State: mission_roster.json per mission

scripts/lazarus.py

@@ -0,0 +1,184 @@
+#!/usr/bin/env python3
+"""Lazarus CLI — Mission invitation and cell spawning.
+
+Usage:
+    lazarus invite [agent] --mission [id] --repo [url]
+    lazarus status --mission [id]
+    lazarus spawn --mission [id] --agent [name]
+    lazarus roster --mission [id]
+
+Parent: #878, #880
+"""
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+from datetime import datetime, timezone
+from pathlib import Path
+
+MISSIONS_DIR = Path(os.path.expanduser("~/missions"))
+ROSTER_FILE = "mission_roster.json"
+
+
+def ensure_missions_dir():
+    MISSIONS_DIR.mkdir(parents=True, exist_ok=True)
+
+
+def mission_dir(mission_id: str) -> Path:
+    return MISSIONS_DIR / mission_id
+
+
+def load_roster(mission_id: str) -> dict:
+    roster_path = mission_dir(mission_id) / ROSTER_FILE
+    if roster_path.exists():
+        return json.loads(roster_path.read_text())
+    return {"mission_id": mission_id, "agents": [], "created": datetime.now(timezone.utc).isoformat()}
+
+
+def save_roster(mission_id: str, roster: dict):
+    roster_path = mission_dir(mission_id) / ROSTER_FILE
+    roster_path.write_text(json.dumps(roster, indent=2))
+
+
+def cmd_invite(args):
+    """Invite an agent into a mission cell."""
+    ensure_missions_dir()
+    mid = args.mission
+    agent = args.agent
+    repo = args.repo
+    role = args.role or "write"
+
+    md = mission_dir(mid)
+    md.mkdir(parents=True, exist_ok=True)
+
+    # Clone repo into mission cell
+    agent_dir = md / "agents" / agent
+    if not agent_dir.exists() and repo:
+        print(f"Cloning {repo} into {agent_dir}...")
+        agent_dir.mkdir(parents=True, exist_ok=True)
+        subprocess.run(["git", "clone", "--depth", "1", repo, str(agent_dir)], check=True)
+
+    # Update roster
+    roster = load_roster(mid)
+    agent_entry = {
+        "name": agent,
+        "role": role,
+        "invited_at": datetime.now(timezone.utc).isoformat(),
+        "status": "invited",
+        "repo": repo,
+        "work_dir": str(agent_dir),
+    }
+
+    roster["agents"] = [a for a in roster["agents"] if a["name"] != agent]
+    roster["agents"].append(agent_entry)
+    save_roster(mid, roster)
+
+    print(f"Invited {agent} to mission {mid} with role '{role}'")
+    print(f"  Work dir: {agent_dir}")
+    print(f"  Roster: {md / ROSTER_FILE}")
+
+
+def cmd_spawn(args):
+    """Spawn an agent in a mission cell with Level 1 isolation."""
+    ensure_missions_dir()
+    mid = args.mission
+    agent = args.agent
+
+    md = mission_dir(mid)
+    agent_dir = md / "agents" / agent
+
+    if not agent_dir.exists():
+        print(f"ERROR: Agent {agent} not found in mission {mid}. Run 'lazarus invite' first.", file=sys.stderr)
+        sys.exit(1)
+
+    # Update roster status
+    roster = load_roster(mid)
+    for a in roster["agents"]:
+        if a["name"] == agent:
+            a["status"] = "active"
+            a["spawned_at"] = datetime.now(timezone.utc).isoformat()
+    save_roster(mid, roster)
+
+    # Level 1 isolation: directory-based
+    env = os.environ.copy()
+    env["HERMES_HOME"] = str(agent_dir / ".hermes")
+    env["HERMES_MISSION_ID"] = mid
+    env["HERMES_MISSION_ROLE"] = next(
+        (a["role"] for a in roster["agents"] if a["name"] == agent), "write"
+    )
+
+    print(f"Spawning {agent} in mission {mid}")
+    print(f"  HERMES_HOME: {env['HERMES_HOME']}")
+    print(f"  Work dir: {agent_dir}")
+    print(f"  Role: {env['HERMES_MISSION_ROLE']}")
+
+    cmd = ["hermes", "chat", "--mission-cell", str(agent_dir)]
+    print(f"  Command: {' '.join(cmd)}")
+
+
+def cmd_status(args):
+    """Show mission status."""
+    mid = args.mission
+    md = mission_dir(mid)
+
+    if not md.exists():
+        print(f"Mission {mid} not found")
+        return
+
+    roster = load_roster(mid)
+    print(f"Mission: {mid}")
+    print(f"Created: {roster.get('created', 'unknown')}")
+    print(f"Agents: {len(roster.get('agents', []))}")
+    print()
+
+    for agent in roster.get("agents", []):
+        status = agent.get("status", "unknown")
+        role = agent.get("role", "unknown")
+        print(f"  {agent['name']:<20} {role:<10} {status}")
+
+
+def cmd_roster(args):
+    """Show mission roster."""
+    mid = args.mission
+    roster = load_roster(mid)
+    print(json.dumps(roster, indent=2))
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Lazarus CLI -- Mission management")
+    sub = parser.add_subparsers(dest="command")
+
+    inv = sub.add_parser("invite", help="Invite agent to mission")
+    inv.add_argument("agent", help="Agent name")
+    inv.add_argument("--mission", required=True, help="Mission ID")
+    inv.add_argument("--repo", required=True, help="Git repo URL")
+    inv.add_argument("--role", choices=["lead", "write", "read", "audit"], default="write")
+
+    sp = sub.add_parser("spawn", help="Spawn agent in mission cell")
+    sp.add_argument("--mission", required=True, help="Mission ID")
+    sp.add_argument("--agent", required=True, help="Agent name")
+
+    st = sub.add_parser("status", help="Mission status")
+    st.add_argument("--mission", required=True, help="Mission ID")
+
+    ro = sub.add_parser("roster", help="Mission roster")
+    ro.add_argument("--mission", required=True, help="Mission ID")
+
+    args = parser.parse_args()
+
+    if args.command == "invite":
+        cmd_invite(args)
+    elif args.command == "spawn":
+        cmd_spawn(args)
+    elif args.command == "status":
+        cmd_status(args)
+    elif args.command == "roster":
+        cmd_roster(args)
+    else:
+        parser.print_help()
+
+
+if __name__ == "__main__":
+    main()