Use the current host manifest format and require restart confirmation on
all management UI paths. Document v3.18.1 as the minimum online upgrade
source while retaining old release manifest reads for supported rollbacks.
Retire middleware v3 and upstream_adapter v1 Fast projections after their
compatibility window. Align SDK and host declarations with the current
contracts, keep risk warnings and per-instance failure isolation, and
exercise native fast_mode values through real plugin subprocesses.
Keep deployment, API and SDK documentation focused on current behavior.
Co-authored-by: Codex <noreply@openai.com>
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