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fix(daemon): normalize usage on BetaMessages to prevent SDK crash (#1667)

Bridge providers (Codex, Copilot) can produce assistant messages
without a usage field on the nested BetaMessage. The Claude Agent
SDK's internal functions access message.usage.input_tokens without
null-checking, causing: "undefined is not an object (evaluating
'K.input_tokens')".

Two fixes:
1. Normalize missing usage on any persisted message that has a
   BetaMessage, before saving to DB. This prevents the crash when
   the SDK subprocess reloads conversation history.
2. Explicitly pass inputTokens in Codex bridge message_delta SSE
   events (tool_use, end_turn, and fallback) instead of relying
   on null-coalescing to null.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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