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>

packages/cloud-platform/cloud/skills.py

@@ -7,14 +7,14 @@ here: any change that affects a host's visible skill set advances that host's
 monotonic ``entitlement_version`` and is recorded in a per-host changelog so
 :meth:`fetch_host_delta` can serve a correct incremental delta.
 """
+
 from __future__ import annotations
 
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from datetime import datetime
 from typing import Any, Literal
 from uuid import uuid4
 
-from core.models import utc_now
 
 SkillKind = Literal["knowledge", "flow_template"]
 SUPPORTED_SKILL_KINDS = frozenset({"knowledge", "flow_template"})
@@ -86,9 +86,7 @@ def validate_skill_input(
 ) -> tuple[str, str, SkillKind]:
     display = " ".join(name.split())
     if not display or len(display) > 200:
-        raise CloudSkillValidationError(
-            "Skill name must contain 1 to 200 characters"
-        )
+        raise CloudSkillValidationError("Skill name must contain 1 to 200 characters")
     if kind not in SUPPORTED_SKILL_KINDS:
         raise CloudSkillValidationError("Skill kind must be knowledge or flow_template")
     if len(description) > 2000: