Add 3.1 model metadata for Google AI and update Gemini tests/examples to use the new handle.
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* auto fixes
* auto fix pt2 and transitive deps and undefined var checking locals()
* manual fixes (ignored or letta-code fixed)
* fix circular import
* remove all ignores, add FastAPI rules and Ruff rules
* add ty and precommit
* ruff stuff
* ty check fixes
* ty check fixes pt 2
* error on invalid
fix: update system prompt metadata label from "Memory blocks were last modified" to "System prompt last recompiled"
When git-based memory is enabled, there are no memory blocks, so the label
"Memory blocks were last modified" is inaccurate. Changed to
"System prompt last recompiled" which accurately reflects the timestamp meaning.
Fixes#9476🐾 Generated with [Letta Code](https://letta.com)
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Co-authored-by: Letta <noreply@letta.com>
