feat(email-writing): add secure contextual-orchestrator tenant boundary

[seonghobae]

Superseded duplicate

This pull request is closed without merge because it is the same contributor head (819c00050fc82617454dea5781f939a15158f071, branch feat/llm-email-writing-orchestrator-task5) already proposed by #1359, but targets master instead of the protected integration branch develop.

At closure, #1359 targets develop@bc98789521d21271e84789888413c182aa111b4d from that exact same head. Keeping both PRs would duplicate review/check evidence and expose a 1,700-file historical master...head comparison unrelated to the bounded email-writing orchestration slice.

Continue review and integration only in #1359. No commit or review evidence is discarded because both PRs reference the same contributor head.

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[github-actions]

PR governance metadata gate is not ready for 819c00050fc82617454dea5781f939a15158f071:

• Required check security is FAILURE on the current head: https://github.com/ContextualWisdomLab/naruon/actions/runs/31884469318/job/95011640806