[ENHANCEMENT] #1511

Problem (one or two sentences)

Hey there,

Some of your requests to OpenCode Go are missing an x-opencode-session header. If we don't have this we cannot properly optimize our service. Starting 09/06 requests missing this header may error.

Here are your useragents that are missing this header:

ZooCode/3.80.1
We don't recognize this client — add x-opencode-session (one stable ID per conversation) or ask its maintainer to.

Thank you.

Context (who is affected and when)

ZooCode/3.80.1
Starting 09/06

Desired behavior (conceptual, not technical)

add x-opencode-session header

Constraints / preferences (optional)

No response

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear context and impact

Zoo Code Task Links (optional)

No response

Acceptance criteria (optional)

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Proposed approach (optional)

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Trade-offs / risks (optional)

No response