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ci: duration-aware weighted shard-split manifest with hash fallback (#2683)

* ci: duration-aware weighted shard-split manifest with hash fallback

shard-split.sh gains an optional weights manifest: a split opts in via a
4th spec field naming scripts/shard-weights.tsv, files listed there are
bucketed by deterministic greedy LPT packing (weight desc, path asc,
least-loaded bucket, ties to lowest index — pure awk, bash 3.2 safe),
and unlisted files keep stableHash % N so new test files still
auto-route with zero maintenance. --verify audits the manifest (missing,
malformed, duplicate, or stale entries fail loudly) and reports
per-bucket TIME balance; the union checks now assert the PACKED
assignment. scripts/generate-shard-weights.ts regenerates the manifest
from CI junit artifacts (merge keeps unmeasured existing weights, drops
deleted files) and prints a before/after preview. 5-space-runtime opts
in with durations from the latest dev CI run: 39.1s/125.3s hash buckets
(86.2s spread) become 82.2s/82.2s packed.

* ci: review fixes for generate-shard-weights

- --dry-run now prints the rendered manifest through the output sink,
  matching what --help promises
- zero-duration suites (<0.5ms rounds to 0ms) are treated as unmeasured
  so they keep the stableHash fallback instead of piling as 0-weight
  entries onto the least-loaded bucket
- the run fails before writing anything when no targeted file has a
  measured duration (wrong --suite or artifact set), instead of writing
  an empty manifest and claiming success

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