Add invoker-side execution policy overrides to interceptor chain#2
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Separate interceptor capability (server-declared type/hooks/configSchema) from execution policy (invoker-declared). Chain entries gain an optional InterceptorOverrides (failOpen, priorityHint, mode, timeoutMs, and narrowing-only hooks) that takes precedence over server-declared defaults, enabling per-deployment control (e.g. audit->active promotion, SLO-based failOpen/timeouts, hook narrowing) without modifying interceptor servers. Also switch capability negotiation to the io.modelcontextprotocol/interceptors extensions namespace and bump the example protocolVersion to 2025-06-18. Signed-off-by: Kurt Degiorgio <kdegiorgio@bloomberg.net>
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Separate interceptor capability (server-declared type/hooks/configSchema) from execution policy (invoker-declared). Chain entries gain an optional InterceptorOverrides (failOpen, priorityHint, mode, timeoutMs, and narrowing-only hooks) that takes precedence over server-declared defaults, enabling per-deployment control (e.g. audit->active promotion, SLO-based failOpen/timeouts, hook narrowing) without modifying interceptor servers.
Also switch capability negotiation to the
io.modelcontextprotocol/interceptors extensions namespace and bump the example protocolVersion to 2025-06-18.