fix: clear flake8 errors blocking Forgejo CI

Break long lines in engagement scaffolding, drop unused Callable import,
and simplify the metrics-cron f-string replace in engagement_promote.

src/kaizen_agentic/engagement.py

@@ -813,7 +813,10 @@ def staff_engagement(
         (dest / agent_name).write_text(body, encoding="utf-8")
     else:
         (dest / agent_name).write_text(
-            f"---\nname: {role_id}\nengagement_id: {engagement_id}\nphase: staffing\n---\n\n# {role_id}\n",
+            (
+                f"---\nname: {role_id}\nengagement_id: {engagement_id}\n"
+                f"phase: staffing\n---\n\n# {role_id}\n"
+            ),
             encoding="utf-8",
         )
 
@@ -856,7 +859,10 @@ def staff_engagement(
         f"# Access plan — {engagement_id}\n\n"
         f"**Target:** {target_kind} `{target_id}`\n\n"
         "Secrets: never stored in this tree.\n\n"
-        "## Verification log\n\n| Date | Result | Notes |\n|------|--------|-------|\n| _pending_ | | RU-01 |\n",
+        "## Verification log\n\n"
+        "| Date | Result | Notes |\n"
+        "|------|--------|-------|\n"
+        "| _pending_ | | RU-01 |\n",
         encoding="utf-8",
     )
     (dest / "schedule.yml").write_text(

src/kaizen_agentic/engagement_promote.py

@@ -17,7 +17,7 @@ import subprocess
 from dataclasses import dataclass, field
 from datetime import date
 from pathlib import Path
-from typing import Any, Callable
+from typing import Any
 
 import yaml
 
@@ -297,10 +297,10 @@ def _promote_definitions(
             f"{from_prefix}-metrics-health-sweep",
             f"{to_prefix}-metrics-health-sweep",
         )
-        new_text = new_text.replace(
-            f"`0 6 * * *`",
-            f"`{loop_crons.get('quality-escalation', {}).get('metrics-health-sweep', '0 6 * * 1')}`",
+        metrics_cron = loop_crons.get("quality-escalation", {}).get(
+            "metrics-health-sweep", "0 6 * * 1"
         )
+        new_text = new_text.replace("`0 6 * * *`", f"`{metrics_cron}`")
         if new_text != text:
             result.actions.append(
                 PromoteAction(