fix: address 54 MEDIUM/LOW priority PR review issues

Comprehensive fixes across Python code, shell scripts, and documentation
addressing all remaining MEDIUM and LOW priority review comments.

Python Code Fixes (27 fixes):
- tools/info.py: Simplified dispatch with lookup tables, defensive guards,
  CPU fallback formatting, !s conversion flags, module-level sync assertion
- tools/docker.py: Case-insensitive container ID regex, keyword-only confirm,
  module-level ALL_ACTIONS constant
- tools/virtualization.py: Normalized single-VM dict responses, unified
  list/details queries
- core/client.py: Fixed HTTP client singleton race condition, compound key
  substring matching for sensitive data redaction
- subscriptions/: Extracted SSL context creation to shared helper in utils.py,
  replaced deprecated ssl._create_unverified_context API
- tools/array.py: Renamed parity_history to parity_status, hoisted ALL_ACTIONS
- tools/storage.py: Fixed dict(None) risks, temperature 0 falsiness bug
- tools/notifications.py, keys.py, rclone.py: Fixed dict(None) TypeError risks
- tests/: Fixed generator type annotations, added coverage for compound keys

Shell Script Fixes (13 fixes):
- dashboard.sh: Dynamic server discovery, conditional debug output, null-safe
  jq, notification count guard order, removed unused variables
- unraid-query.sh: Proper JSON escaping via jq, --ignore-errors and --insecure
  CLI flags, TLS verification now on by default
- validate-marketplace.sh: Removed unused YELLOW variable, defensive jq,
  simplified repository URL output

Documentation Fixes (24+ fixes):
- Version consistency: Updated all references to v0.2.0 across pyproject.toml,
  plugin.json, marketplace.json, MARKETPLACE.md, __init__.py, README files
- Tool count updates: Changed all "26 tools" references to "10 tools, 90 actions"
- Markdown lint: Fixed MD022, MD031, MD047 issues across multiple files
- Research docs: Fixed auth headers, removed web artifacts, corrected stale info
- Skills docs: Fixed query examples, endpoint counts, env var references

All 227 tests pass, ruff and ty checks clean.

unraid_mcp/tools/health.py

@@ -21,12 +21,24 @@ from ..config.settings import (
 from ..core.client import make_graphql_request
 from ..core.exceptions import ToolError
 
+
 HEALTH_ACTIONS = Literal["check", "test_connection", "diagnose"]
 
 # Severity ordering: only upgrade, never downgrade
 _SEVERITY = {"healthy": 0, "warning": 1, "degraded": 2, "unhealthy": 3}
 
 
+def _server_info() -> dict[str, Any]:
+    """Return the standard server info block used in health responses."""
+    return {
+        "name": "Unraid MCP Server",
+        "version": VERSION,
+        "transport": UNRAID_MCP_TRANSPORT,
+        "host": UNRAID_MCP_HOST,
+        "port": UNRAID_MCP_PORT,
+    }
+
+
 def register_health_tool(mcp: FastMCP) -> None:
     """Register the unraid_health tool with the FastMCP instance."""
 
@@ -71,7 +83,7 @@ def register_health_tool(mcp: FastMCP) -> None:
             raise
         except Exception as e:
             logger.error(f"Error in unraid_health action={action}: {e}", exc_info=True)
-            raise ToolError(f"Failed to execute health/{action}: {str(e)}") from e
+            raise ToolError(f"Failed to execute health/{action}: {e!s}") from e
 
     logger.info("Health tool registered successfully")
 
@@ -108,15 +120,9 @@ async def _comprehensive_check() -> dict[str, Any]:
 
         health_info: dict[str, Any] = {
             "status": "healthy",
-            "timestamp": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+            "timestamp": datetime.datetime.now(datetime.UTC).isoformat(),
             "api_latency_ms": api_latency,
-            "server": {
-                "name": "Unraid MCP Server",
-                "version": VERSION,
-                "transport": UNRAID_MCP_TRANSPORT,
-                "host": UNRAID_MCP_HOST,
-                "port": UNRAID_MCP_PORT,
-            },
+            "server": _server_info(),
         }
 
         if not data:
@@ -201,15 +207,9 @@ async def _comprehensive_check() -> dict[str, Any]:
         logger.error(f"Health check failed: {e}")
         return {
             "status": "unhealthy",
-            "timestamp": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+            "timestamp": datetime.datetime.now(datetime.UTC).isoformat(),
             "error": str(e),
-            "server": {
-                "name": "Unraid MCP Server",
-                "version": VERSION,
-                "transport": UNRAID_MCP_TRANSPORT,
-                "host": UNRAID_MCP_HOST,
-                "port": UNRAID_MCP_PORT,
-            },
+            "server": _server_info(),
         }
 
 
@@ -225,7 +225,7 @@ async def _diagnose_subscriptions() -> dict[str, Any]:
         connection_issues: list[dict[str, Any]] = []
 
         diagnostic_info: dict[str, Any] = {
-            "timestamp": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+            "timestamp": datetime.datetime.now(datetime.UTC).isoformat(),
             "environment": {
                 "auto_start_enabled": subscription_manager.auto_start_enabled,
                 "max_reconnect_attempts": subscription_manager.max_reconnect_attempts,
@@ -258,7 +258,7 @@ async def _diagnose_subscriptions() -> dict[str, Any]:
     except ImportError:
         return {
             "error": "Subscription modules not available",
-            "timestamp": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+            "timestamp": datetime.datetime.now(datetime.UTC).isoformat(),
         }
     except Exception as e:
-        raise ToolError(f"Failed to generate diagnostics: {str(e)}") from e
+        raise ToolError(f"Failed to generate diagnostics: {e!s}") from e