⚡ Bolt: Prevent N+1 query bottlenecks when retrieving email threads

[schmug]

💡 What: Replaced sequential stub.getEmail calls within a Promise.all mapping with a single call to getFullThread(stub, emailData.threadId).
🎯 Why: Promise.all(stub.getEmail) resulted in an N+1 query problem, making a network/stub roundtrip for each individual email within a thread in workers/agent/index.ts. getFullThread leverages the Durable Object's backend database to run a batched query, fetching the entire thread much more efficiently. It also handles mapping body_text and sorting chronologically natively.
📊 Impact: Eliminates N network/RPC calls and changes thread loading from O(N) database operations to O(1) in the DO context, yielding a substantial speedup when initializing AI email agents on large threads.
🔬 Measurement: Verify by executing npm run test -- tests/agent/ to ensure agent thread fetching still functions flawlessly and by validating that the agent generates accurate thread contexts with the new implementation.

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PR created automatically by Jules for task 932911303028395440 started by @schmug

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