audit-1 (critical 1): mandatory operator signatures bound to content+deployment

- signing module: canonical content hashes + approval_message
  sha256(cayce-ops:<type>:<deployment_id>:<id>:<content_hash>)
- approve/approve-draft/publisher-approve REQUIRE signature; without
  CAYCE_OPS_OPERATOR_PUBKEY+DEPLOYMENT_ID the daemons refuse to
  execute/send/publish (no degraded mode)
- run-time re-verification at execute/send/publish: unsigned rows (raw SQL
  approval) or edited content revert to pre-approval state, audited as error
- FULL signatures stored on rows (operator_signature, migration 0003) and
  in audit detail — never truncated
- signature failures audited from CLI wrappers too (1f)
- AUTONOMOUS_MODE approval path removed (D13): no non-human approvals

tests: SQL-approved row refused at execute/send/publish; to_addr change
blocks send; foreign deployment/content signatures refused; full-signature
persistence. 65 tests green.

cayceops/cli.py

@@ -74,10 +74,10 @@ def executor_approve(
     proposal_id: int,
     actor: str = typer.Option(..., help="Human approver id"),
     signature: str = typer.Option(
-        None, help="BIP-340 sig (required when operator pubkey is set)"
+        ..., help="BIP-340 sig over the approval message (mandatory)"
     ),
 ) -> None:
-    """Approve a proposal (human action, audited)."""
+    """Approve a proposal (human action, audited; signature mandatory)."""
     raise typer.Exit(
         _load_component("executor").approve(proposal_id, actor, signature=signature)
     )
@@ -101,9 +101,17 @@ def maild_poll() -> None:
 
 
 @maild_app.command("approve-draft")
-def maild_approve(msg_id: int, actor: str = typer.Option(...)) -> None:
-    """Approve a drafted reply so SMTP may send it."""
-    raise typer.Exit(_load_component("maild").approve_draft(msg_id, actor))
+def maild_approve(
+    msg_id: int,
+    actor: str = typer.Option(...),
+    signature: str = typer.Option(
+        ..., help="BIP-340 sig over the approval message (mandatory)"
+    ),
+) -> None:
+    """Approve a drafted reply so SMTP may send it (signature mandatory)."""
+    raise typer.Exit(
+        _load_component("maild").approve_draft(msg_id, actor, signature)
+    )
 
 
 @maild_app.command("send-approved")
@@ -153,9 +161,17 @@ def publisher_image(item_id: int) -> None:
 
 
 @publisher_app.command("approve")
-def publisher_approve(item_id: int, actor: str = typer.Option(...)) -> None:
-    """Approve a draft content item."""
-    raise typer.Exit(_load_component("publisher").approve(item_id, actor))
+def publisher_approve(
+    item_id: int,
+    actor: str = typer.Option(...),
+    signature: str = typer.Option(
+        ..., help="BIP-340 sig over the approval message (mandatory)"
+    ),
+) -> None:
+    """Approve a draft content item (signature mandatory)."""
+    raise typer.Exit(
+        _load_component("publisher").approve(item_id, actor, signature)
+    )
 
 
 @publisher_app.command("publish-due")
@@ -187,6 +203,12 @@ def monitor_run() -> None:
     raise typer.Exit(_load_component("monitor").build())
 
 
+@monitor_app.command("anchor")
+def monitor_anchor() -> None:
+    """Publish today's audit-chain anchor as a signed Nostr note (1/day)."""
+    raise typer.Exit(_load_component("monitor").anchor())
+
+
 def main() -> None:  # pragma: no cover
     app()