Since b0c6762bc, every rule inside a referenced rule-set was evaluated
as if merged into the outer rule, which required tracking per-branch
group states and let outer rules and rule-set rules satisfy each
other's grouped conditions in both directions.
Restrict merging to the only designed case: a rule-set containing
exactly one non-inverted default rule is merged into the outer rule as
before. Any other rule-set now matches as an ordinary condition of the
outer rule: it matches when any of its rules matches on its own, and
its rules no longer exchange grouped match state with the outer rule
in either direction. Multiple referenced rule-sets keep OR semantics.
Flat address rule-sets such as generated geosite/geoip sets contain a
single default rule, so their behavior is unchanged. The group-state
set machinery is replaced by a single required/satisfied mask pair.
Also update the route and DNS rule docs.
Treat rule_set items as merged branches instead of standalone boolean
sub-items.
Evaluate each branch inside a referenced rule-set as if it were merged
into the outer rule and keep OR semantics between branches. This lets
outer grouped fields satisfy matching groups inside a branch without
introducing a standalone outer fallback or cross-branch state union.
Keep inherited grouped state outside inverted default and logical
branches. Negated rule-set branches now evaluate !(...) against their
own conditions and only reapply the outer grouped match after negation
succeeds, so configs like outer-group && !inner-condition continue to
work.
Add regression tests for same-group merged matches, cross-group and
extra-AND failures, DNS merged-branch behaviour, and inverted merged
branches. Update the route and DNS rule docs to clarify that rule-set
branches merge into the outer rule while keeping OR semantics between
branches.
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