The_floor_is_lava_ring carried raw commitTicks with no arrival guard and no
no-reversal guard. Port the behaviour of tfil's j144 fix on RING-SPECIFIC env
names (TR_TFIL_RING_COMMIT_ARRIVAL, TR_TFIL_RING_NOREV_SPEED) so the two forks
never share a namespace. Both default OFF: with them unset the ring mover is
byte-for-byte the pre-change mover over the whole 20026-tick fixture replay
(golden generated from git show HEAD:..., checked by tfil_ring_replay.nim).
Structural differences from tfil, all noted in the code:
* ring has no TfilTileReplanMode - the tile-crossing cancel is unconditional
self-tile, so the arrival guard is just 'not TfilRingCommitArrival'.
* ring has no replanReason enum, so the arrival/danger/expiry outcomes are a
local bool; the default-off path keeps ring's original dec/no-dec exactly.
* ring's MinCommitTicks is 0 (tfil's is 5), so the arrival branch is evaluated
from the first committed tick. Left as is: changing it would change the
default path.
* ring's ScoredTile carries no turnDeg, so the no-reversal offsets are
computed by ringTileOffTravel at the pick site.
TR_TFIL_COMMIT_MARGIN (tfil's hysteresis) is deliberately NOT ported: it is a
third knob, outside the two named, and inert at its 0.0 default.
No other tfil mechanism touched: no turn-cost tiebreak, TR_TFIL_ARRIVE_TICKS,
TR_FIRE_LAG, heat-field override, corridor bound, hold, or geometry weighting.
No default changed anywhere.
SirStone
fe77056459