Fixed color map for session node kinds, so timeline bars are colored the
same wherever they are drawn. The fill is identical for like kinds, making
same-color overlap read as a parallel process (only grid cells run
concurrently; containers and sequential steps never share a fill and a
time span). Kinds outside the fixed map fall back to rtemis_colors,
recycled as needed.
Details
Exported so rtemis.server can attach the map to its job.result session
slice and announce it on the ready frame, which is what lets the rtemislive
web UI color its timeline bars and its live progress panel without a
hard-coded palette of its own - one definition, here, for every renderer.
Exported for rtemis interfaces and marked @keywords internal.