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.

skills/unraid/references/api-reference.md

@@ -917,7 +917,7 @@ Common differences from online documentation:
 2. **Use `array.disks` for array disks** - The top-level `disks` query includes ALL disks (USB, SSDs, etc.)
 3. **Always check errors** - GraphQL returns errors in `errors` array
 4. **Use introspection** - Field names can vary between versions
-5. **Sizes are in kilobytes** - Disk sizes and capacities are in KB, not bytes
+5. **Sizes vary by context** - Disk/array capacities are in kilobytes; memory values (from `info.memory`) are in bytes
 6. **Temperature is Celsius** - All temperature values are in Celsius
 7. **Handle empty arrays** - Many queries return `[]` when no data exists
 8. **Use viewer role** - Create API keys with "Viewer" role for read-only access
@@ -926,8 +926,8 @@ Common differences from online documentation:
 
 ## 🚫 Known Limitations
 
-1. **No Docker container logs** - Container output logs are NOT accessible via API
-2. **No real-time streaming** - All queries are request/response, no WebSocket subscriptions
+1. **No Docker container logs** - Container output logs are NOT accessible via the read-only query API (use `docker.logs` mutation)
+2. **WebSocket subscriptions are available** - The Unraid API supports real-time subscriptions (array, Docker stats, notifications, etc.) via WebSocket
 3. **Some queries require higher permissions** - Read-only "Viewer" role may not access all queries
 4. **No mutation examples included** - This guide covers read-only queries only