Miha Kralj dafc569f4c Add series algebra and signal predicates layer ...

Series arithmetic (lib/numerics):
- Add, Sub, Mul, Div, Lag, reusing BiInputIndicatorBase at period=1
- Div publishes 0.0 (not NaN) on a zero denominator, since a non-finite
  ComputeError result permanently poisons the base's running sum
- BiInputIndicatorBase gains Subscribe(a, b) implementing the
  strategy-primitives spec's time-join rule for event-chained two-input nodes

Phase 0 contracts (lib/core):
- TTradeContext, BracketFlags, ExitReason, TrendState, VolState
- SignalConstants (DefaultEpsilon, TruthThreshold), OutOfRangePolicy
- ConfirmOnClose: bar-confirmation wrapper (Section 8.6)

Signal predicates (lib/signals/predicates), Phase 1:
- Above, Below, Equal (ComparePredicateBase<TOp> generic comparison core)
- InsideChannel, OutsideChannel, ChannelPosition (new MultiInputBase,
  3-input time-join)
- IsRising, IsFalling (exclude current bar, confirm-then-push window)
- AtHighest, AtLowest (include current bar, rebuild-on-correction,
  mirrors channels/Dc)
- Hysteresis, PercentDistance

All new nodes ship with .cs, tests, and .md docs; indices and the
StrategyPrimitives.Spec.md are updated with placement decisions and
design notes. Full suite: 16730 tests, 0 failures, 0 warnings.

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..

tests

Add series algebra and signal predicates layer

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Sub.cs

Add series algebra and signal predicates layer

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Sub.md

Add series algebra and signal predicates layer

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