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.

tests/test_storage.py

@@ -1,5 +1,6 @@
 """Tests for unraid_storage tool."""
 
+from collections.abc import Generator
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -36,7 +37,7 @@ class TestFormatBytes:
 
 
 @pytest.fixture
-def _mock_graphql() -> AsyncMock:
+def _mock_graphql() -> Generator[AsyncMock, None, None]:
     with patch("unraid_mcp.tools.storage.make_graphql_request", new_callable=AsyncMock) as mock:
         yield mock
 
@@ -98,7 +99,7 @@ class TestStorageActions:
         }
         tool_fn = _make_tool()
         result = await tool_fn(action="disk_details", disk_id="d:1")
-        assert result["summary"]["temperature"] == "35C"
+        assert result["summary"]["temperature"] == "35\u00b0C"
         assert "1.00 GB" in result["summary"]["size_formatted"]
 
     async def test_disk_details_not_found(self, _mock_graphql: AsyncMock) -> None:
@@ -124,3 +125,32 @@ class TestStorageActions:
         tool_fn = _make_tool()
         result = await tool_fn(action="logs", log_path="/var/log/syslog")
         assert result["content"] == "log line"
+
+
+class TestStorageNetworkErrors:
+    """Tests for network-level failures in storage operations."""
+
+    async def test_logs_json_decode_error(self, _mock_graphql: AsyncMock) -> None:
+        """Invalid JSON response when reading logs should propagate as ToolError."""
+        _mock_graphql.side_effect = ToolError(
+            "Invalid JSON response from Unraid API: Expecting value: line 1 column 1"
+        )
+        tool_fn = _make_tool()
+        with pytest.raises(ToolError, match="Invalid JSON"):
+            await tool_fn(action="logs", log_path="/var/log/syslog")
+
+    async def test_shares_connection_refused(self, _mock_graphql: AsyncMock) -> None:
+        """Connection refused when listing shares should propagate as ToolError."""
+        _mock_graphql.side_effect = ToolError(
+            "Network connection error: [Errno 111] Connection refused"
+        )
+        tool_fn = _make_tool()
+        with pytest.raises(ToolError, match="Connection refused"):
+            await tool_fn(action="shares")
+
+    async def test_disks_http_500(self, _mock_graphql: AsyncMock) -> None:
+        """HTTP 500 when listing disks should propagate as ToolError."""
+        _mock_graphql.side_effect = ToolError("HTTP error 500: Internal Server Error")
+        tool_fn = _make_tool()
+        with pytest.raises(ToolError, match="HTTP error 500"):
+            await tool_fn(action="disks")