v3.7.0: Prevent redundant decompilation by agents

What's New

Fixes a critical agent workflow issue where LLM agents would repeatedly run ILSpy decompilation instead of using the pre-built Roslyn index for code lookups, wasting significant time on each query.

Problem

Agents were calling decompile_game over and over (with the same params) then grepping the output, instead of using search_game_code / get_entity_source / browse_namespace which read from the pre-built Roslyn index in milliseconds.

Fixes

• Guard on decompile_game: Now checks if source already exists (>100 .cs files) and returns early with a message pointing to search tools. Added force parameter to override when actually needed (game updates)
• Updated tool descriptions: All code lookup tools (search_game_code, get_entity_source, browse_namespace, get_setup_status) now explicitly state the index is pre-built and ready, with clear "do NOT call decompile_game" guidance
• Fixed misleading error message: game_data.py no longer directs agents to call decompile_game when indexing isn't ready — points to get_setup_status instead
• Stronger decompile_game description: Clearly states this is only for game updates, not normal code lookups

Changed Files

• sts2mcp/server.py — Tool descriptions + decompile guard with force parameter
• sts2mcp/game_data.py — Error message fix
• pyproject.toml — Version bump to 3.7.0