feat(11-03): re-authorize every Centrifugo subscribe through a namespace registry
- lighthouse: Registry of namespace authorizers (Result, Allowed, Denied),
ParseChannel, ChannelID with PHP (int)-cast semantics (PHPInt, pinned by
a php -r table test), FormatChannels, WithClientID/ClientID
- centrifugo: ProxyHandler (constant-time X-Centrifugo-Secret, HTTP 200
generic deny, info [] on allow, presence allow/override merge, 64 KiB
body cap) mounted as the ServerToServer subscribe route
- README: proxy contract, registry and channel rules
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