fix(#812): direction-aware signal display for DynamicRailSemaphore

[Copilot]

DynamicRailSemaphore.signal is a single field — not keyed by direction or train. Once any train's forward-direction reservation lights a semaphore FREE, all consumers (canvas renderers, LLM dispatcher's all_signal_aspects) see proceed regardless of which direction they're asking about. The movement-safety gap was closed in 28e3389 via ownership-checked wakeup in Train.kt; this PR fixes the perception/rendering truthfulness side.

Core change

New isAllowingFor(from, to) on DynamicRailSemaphore:

fun isAllowingFor(from: Cell.Segment?, to: Cell.Segment?): Boolean {
    if (!signal.isAllowing()) return false
    val d = staticRef.direction()
    return to == d && from == anti(d)
}

Returns true only when the signal is allowing and the queried direction matches the canonical forward direction (anti(direction()) → direction()).

Consumer updates

• PerceptionMapping.separatorAspect — replaces raw signal read with isAllowingFor(anti(d), d). Train reactive decisions now see STOP when the semaphore is lit for the opposite direction.
• AnimationStateCapture.captureSignalState — same guard; canvas animation no longer paints proceed for a semaphore authorized by an opposite-direction reservation.
• DefaultNetworkPerceptionPort — adds private DynamicRailSemaphore.toReading() extension that populates two new SemaphoreReading fields.

LLM dispatcher perception

SemaphoreReading gains two nullable direction fields (backward-compatible defaults null):

data class SemaphoreReading(
    val name: String,
    val signal: Signal,
    val authorizedFrom: String? = null,   // e.g. "F" — populated only when allowing
    val authorizedTo: String? = null      // e.g. "A"
)

allSignalAspects / signalAspect now include which direction the proceed is authorized for, so the LLM dispatcher can distinguish "clear for me" from "clear for the other train."

Tests

• 6 new isAllowingFor tests in DynamicRailSemaphoreTest (STOP, forward, reverse, after cancel, null segments, second orientation).
• DefaultNetworkPerceptionPortTest semaphore mock updated to stub direction() and isAllowingFor; 6 SemaphoreReading assertions updated to expect the new direction fields.

• Fixes DynamicRailSemaphore signal display is direction-agnostic (canvas + all_signal_aspects show false proceed for the opposite direction) #812

[bedaHovorka]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
97.6% Coverage on New Code
0.0% Duplication on New Code

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