Remove backward compatibility aliases from plugin run_tool()

[rogermt]

Phase 12/13: Simplify tool execution by removing legacy "default" tool name alias support.

Background

• OCR run_tool() accepts tool_name="default" → maps to "analyze"
• YOLO run_tool() accepts tool_name="default" → maps to first tool in dict
• These aliases were added for transition compatibility
• Current state: All callers use proper tool names

Change

Remove alias logic:

• OCR: Delete if tool_name in ("default", "analyze") → keep only if tool_name == "analyze"
• YOLO: Delete if tool_name == "default": tool_name = next(...) logic

Impact

• Server already sends proper tool names (never sends "default")
• Simplifies run_tool() contract
• Breaks callers using "default" (none currently do)

Files to update

• plugins/ocr/src/forgesyte_ocr/plugin.py L239-240
• plugins/forgesyte-yolo-tracker/src/forgesyte_yolo_tracker/plugin.py L272-274

Related

• Depends on #164 (Phase 12 priority)