fix(newos4): outboxResult scoped, markdown mime, old reply path retired (v4.6.81)

delegateTask declared `const outboxResult` inside the AI branch and returned it outside, so a
delegation with the AI module missing threw 'outboxResult is not defined'. The catch turned that
into _handleAgentFailure: the worker stayed idle with no result while spawn_agent reported ok —
the reported symptom exactly. Now function-scoped, and the no-module path returns
'queued — AI module not loaded, nothing executed' rather than claiming 'completed'.

Also: nginx served _docs/*.md as application/octet-stream (no .md type) — now text/markdown +
nosniff; agent-replies.php returns 410 for GET as well as POST, so there is one reply path.

Verified: with the AI module deleted at runtime, delegateTask returns the queued string and
throws nothing.

0 files changed, 0 insertions, 0 deletions