* feat: add flattened feedback context fields for PostHog filterability
Add system info (local_time, device_type, cwd), session stats (token counts,
timing), agent info (agent_name, agent_description, model), and account info
(billing_tier) as flat top-level fields to the /v1/metadata/feedback endpoint.
Flat fields allow direct PostHog filtering/breakdown without HogQL.
🐾 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta <noreply@letta.com>
* chore: regenerate API specs
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Co-authored-by: Letta <noreply@letta.com>
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