Fix Steam/Epic game stop issue with improved status reporting and clear warnings

[Copilot]

Problem

GABS was providing misleading feedback when attempting to stop Steam/Epic games. The issue manifested as:

• games_stop reported "success" even though only the launcher process was stopped
• The actual game process continued running independently
• AI assistants received false "stopped" status while games were still active
• Users were confused about GABS capabilities and actual game state

This occurred because GABS only manages launcher processes for Steam/Epic games, not the actual game processes that run independently.

Solution

This PR implements comprehensive improvements to provide honest, transparent feedback about GABS limitations:

Enhanced Status Reporting

• Clear status descriptions: "launched via SteamAppId (GABS cannot track the game process)" instead of vague "launched"
• Differentiated statuses: Direct processes show "running (GABS controls the process)" while launcher games show tracking limitations
• Informative explanations: Status checks include helpful notes about checking Steam/Epic for actual game state

Honest Stop Commands

• Transparent warnings: Steam/Epic stop attempts now show "⚠️ launcher process stopped, but actual SteamAppId game may still be running independently"
• Clear guidance: Provides specific instructions: "Please stop the game through SteamAppId or the game's own interface"
• Not marked as errors: Warnings are informational, not failures, since this is expected behavior

Proactive User Education

• Games list warnings: Shows "Note: GABS can start but cannot directly stop SteamAppId games" upfront
• Consistent messaging: All tools provide clear explanations of GABS capabilities and limitations
• Actionable instructions: Users know exactly what to do when GABS can't directly control games

Example

Before:

{"result": {"content": [{"text": "Game 'rimworld' stopped successfully"}]}}

Game actually still running - misleading!

After:

{
  "result": {
    "content": [{
      "text": "⚠️ launcher process stopped, but actual SteamAppId game may still be running independently. GABS cannot directly control SteamAppId-launched games. Please stop the game through SteamAppId or the game's own interface\n\nNote: For Steam/Epic games, GABS can only stop the launcher process, not the actual game."
    }]
  }
}

Clear, honest, actionable feedback!

Testing

• ✅ All existing tests pass (no regressions)
• ✅ Comprehensive new test suite validates the fix
• ✅ DirectPath games maintain full start/stop/status functionality
• ✅ Steam/Epic games provide clear, helpful feedback about limitations
• ✅ Status reporting is accurate and informative across all game types

This change transforms GABS from providing misleading "success" messages to being completely transparent about its actual capabilities, ensuring AI assistants and users receive accurate information to make informed decisions.

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