chore(skills): docs + ruff format for skill-management-console

Documents Skill Management in CLOUD_DEPLOYMENT.md (cloud-skill store,
per-host entitlement, incremental sync, local authoring/override,
inventory report, skills:admin scope) and applies ruff check/format to
all touched modules. All tasks complete; full non-integration suite
green (593 passed) and openspec validate --strict passes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/skill_sync.py

@@ -7,6 +7,7 @@ truth" contract is enforced by that import boundary.
 
 Push (webhook) is optional; the baseline pull loop is correct standalone.
 """
+
 from __future__ import annotations
 
 import logging
@@ -185,9 +186,7 @@ class CloudApiSkillClient:
         response.raise_for_status()
         return _parse_cloud_sync_payload(response.json())
 
-    def report_inventory(
-        self, host_id: str, inventory: list[dict[str, Any]]
-    ) -> None:
+    def report_inventory(self, host_id: str, inventory: list[dict[str, Any]]) -> None:
         """Best-effort local-skill inventory report to the Cloud (design D7)."""
         response = self._ensure_client().post(
             f"{self.base_url}/internal/v1/hosts/{host_id}/skills/inventory",
@@ -312,9 +311,7 @@ class SkillSyncRunner:
                 subscription_id, since_version=since_version
             )
         except Exception as exc:
-            log.warning(
-                "skill sync fetch failed for %s: %s", subscription_id, exc
-            )
+            log.warning("skill sync fetch failed for %s: %s", subscription_id, exc)
             self.store._set_subscription_state(
                 subscription_id,
                 last_error=f"{type(exc).__name__}: {exc}",