* fix(core): pass org_id to dulwich via header for git HTTP
* fix(core): use actor org id for git HTTP org header
Git smart HTTP proxies were reading `organization_id` from AgentState, which
is not present and caused 500s during clone/push. Use the authenticated
actor's org id while still performing an authorization check on the agent.
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Co-authored-by: Letta <noreply@letta.com>
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