Three bugs, all found by driving the add-on in a real Theseus and
watching the egress IP rather than reasoning about it.
1. The generated config used pre-1.11 schema. `sniff` on an inbound and
the `block` outbound type were deprecated in sing-box 1.11 and
REMOVED in 1.13, so 1.14.1 refused the whole file and exited 1.
Routing is now a bare `final`; rule `action` semantics changed in
1.12 and the explicit inbound→outbound rule was never needed.
2. xray-core 26.3.27's REALITY would not complete a handshake with a
sing-box client — and, after ruling out keys (three derivations, a
fresh pair used verbatim), shortIds (explicit and empty), clock skew,
dest reachability, TLS 1.3/X25519 on the dest, and xtls-rprx-vision,
not with a correctly configured xray client either. sing-box against
sing-box works first try. The exits now run sing-box, which is what
the add-on already ships to every client, so there is no longer a
cross-implementation surface at all. Migration script included; it
keeps the port, the SNI and the existing uuid pool and only changes
the Reality keypair.
Worth recording separately: xray's REALITY inbound field is `dest`,
not sing-box's `target`. That was wrong too, independently.
3. leaseEndpoint cached the full vless URL. The Reality key and short id
live inside that URL, so re-keying an exit left every client failing
against a stale copy for the whole 24h lease. It now caches only the
uuid and rebuilds the URL from the current catalogue entry, so a
re-key takes effect as soon as the catalogue refreshes.
Verified in Theseus over CDP: baseline 80.187.100.105, tunnel up
81.31.210.65 (the sm-1 exit), off restores the baseline, and sm-3 is
correctly refused to a free-tier caller.
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