feat(orchestrator): MVP synthetic life-injection worker (SSH only)

Adds a new decnet orchestrate worker whose job is to keep the honeypot
ecosystem from looking suspiciously static — a frozen LAN with no
inter-host traffic and no filesystem aging is its own honeypot tell.

MVP scope:
- New OrchestratorEvent table + repo methods (purpose-built sibling
  to Log so synthetic events stay separable from attacker-driven ones).
- New orchestrator.{activity,file}.<decky_id> bus topics +
  system.orchestrator.health heartbeat.
- SSH-only driver. Traffic action runs python3 inside src container
  to TCP-connect dst:22 and read the SSH banner — real on-the-wire
  SSH-protocol traffic without shipping creds. File action drops or
  refreshes a small file via docker exec on the destination.
- Random scheduler (50/50 traffic/file when >=2 SSH-capable deckies
  are running). Diurnal shaping, role-aware pairing, and session-aware
  backoff are explicit non-goals for MVP.
- CLI registration, systemd unit (SupplementaryGroups=docker),
  worker-registry entry so the dashboard shows orchestrator health.
- 11 tests: scheduler policy, driver argv shape + injection-safety,
  end-to-end one-tick integration with FakeBus + SQLite.

decnet/web/db/models/__init__.py

@@ -53,6 +53,9 @@ from .health import (
     ComponentHealth,
     HealthResponse,
 )
+from .orchestrator import (
+    OrchestratorEvent,
+)
 from .logs import (
     Bounty,
     BountyResponse,
@@ -181,6 +184,8 @@ __all__ = [
     # health
     "ComponentHealth",
     "HealthResponse",
+    # orchestrator
+    "OrchestratorEvent",
     # logs
     "Bounty",
     "BountyResponse",

decnet/web/db/models/orchestrator.py

@@ -0,0 +1,52 @@
+"""Orchestrator-emitted activity events.
+
+Purpose-built sibling to ``logs.Log`` so attacker-originated events stay
+cleanly separable from synthetic life-injection events at query time.
+The orchestrator worker is the sole writer.
+"""
+from datetime import datetime, timezone
+from typing import Optional
+from uuid import uuid4
+
+from sqlalchemy import Column, Index, Text
+from sqlmodel import Field, SQLModel
+
+
+class OrchestratorEvent(SQLModel, table=True):
+    """One orchestrator-driven action against a decky.
+
+    ``kind`` discriminates the two MVP flavours:
+
+    * ``"traffic"`` — a protocol-driven interaction (SSH command exec for
+      MVP). ``src_decky_uuid`` is the *logical* originator and may differ
+      from the actual TCP source for the duration of the MVP, where the
+      orchestrator process drives the connection from the host. ``v1``
+      will execute the connection from inside the source container.
+    * ``"file"``  — a filesystem touch via ``docker exec`` against the
+      destination decky. ``src_decky_uuid`` is null.
+
+    ``payload`` is the per-action JSON envelope: command run, exit code,
+    stdout/stderr digest, file path, byte counts, etc. Schema is
+    deliberately loose — the worker can extend it without a migration.
+    """
+    __tablename__ = "orchestrator_events"
+    __table_args__ = (
+        Index("ix_orchestrator_events_dst_ts", "dst_decky_uuid", "ts"),
+    )
+    uuid: str = Field(default_factory=lambda: str(uuid4()), primary_key=True)
+    ts: datetime = Field(
+        default_factory=lambda: datetime.now(timezone.utc), index=True
+    )
+    kind: str = Field(index=True, max_length=16)              # traffic|file
+    protocol: str = Field(index=True, max_length=16)          # ssh for MVP
+    action: str = Field(max_length=64)                         # exec:uptime|file:create|...
+    src_decky_uuid: Optional[str] = Field(
+        default=None, foreign_key="topology_deckies.uuid", index=True
+    )
+    dst_decky_uuid: str = Field(
+        foreign_key="topology_deckies.uuid", index=True
+    )
+    success: bool = Field(default=False, index=True)
+    payload: str = Field(
+        sa_column=Column("payload", Text, nullable=False, default="{}")
+    )