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ci: rebalance online splits (rpc/features/space/rewind) with duration weights (#2686)

All four online hash splits opt into scripts/shard-weights.tsv (regenerated
from the latest dev CI junit, run 14144 @ 7ec34de38) so buckets pack by
measured duration instead of file count, and space drops 4→3 buckets (its
max is floored by the 77s task-agent-lifecycle file either way; the 4th
bucket held the 10s file alone). rpc/features keep 6/3 buckets: max files
49s/41s floor them, and packed spreads land 7.4s/6.3s. rewind stays 2-way,
floored by the 95s rewind-feature file. Per-bucket test time before →
after (suite seconds):
  rpc      45/83/15/22/41/59 → 49/48/42/43/42/42 (spread 68s → 7.4s)
  features  5/31/75         → 41/35/36          (spread 71s → 6.3s)
  space    77/10/56/32      → 77/56/42          (4 jobs → 3)
  rewind   95/64            → 95/64             (duration-pinned now)
main.yml drops space-d, .coveralls.yml drops its flag, and the
validate-test-matrix fixture parses the specs' new 4th weights field.
Guards green: test-online.sh --verify, validate-test-matrix.sh.

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