fix: resolve gemini empty content error and improve max iteration fal…

[zilin]

…lback

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• [*] 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📖 Documentation update
• ⚡ Code refactoring (no functional changes, no api changes)

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• My code/docs follow the style of this project.
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• I have updated the documentation accordingly.

[nikolasdehor]

This PR has several significant issues: (1) Compilation error: The indentation and brace matching in runAgentLoop (around lines 519-534) appears broken. There is an extra } and mixed indentation that will likely cause a compile failure. Please verify the code compiles cleanly. (2) Empty PR description: Please fill in the PR template — what specific Gemini error is this fixing? (3) Silent suppression is dangerous: Setting finalContent to empty when sentUserContent is true means the agent sends nothing back to the user. If a tool sent a partial result but the LLM had more to say, the user now sees silence. (4) Session continuity broken: Skipping Sessions.AddMessage when finalContent is empty means the session history loses track of what the agent did. (5) Needs tests: This changes core agent loop behavior.