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Playwright --shard distributes by count (per file with fullyParallel:false), blind to duration — measured skew on the 9-shard matrix: 24m47s worst vs 1m47s best (14x), putting E2E on the CI critical path (~25min of the 33min gate). - scripts/quality/balance-e2e-shards.mjs: LPT greedy (heaviest first into the lightest shard) over config/quality/e2e-timings.json; deterministic (weight desc, filename tiebreak); new specs get the median weight; the CLI self-verifies the shard union equals the discovered spec list and exits non-zero on ANY inconsistency (missing timings, lost spec) so the CI step falls back to plain --shard — never fewer specs than before. - config/quality/e2e-timings.json: relative weights seeded from spec LOC (proxy); replace with real per-file durations from a full run when convenient (documented in _meta). LOC-seeded packing already lands at 742-761 per shard (1.03x skew) vs the alphabetical round-robin that produced 14x. - ci.yml test-e2e: balanced list per shard with logged assignment + fallback. TDD: 5 unit tests (LPT invariants, determinism, completeness, median fallback, seed-vs-specs drift guard).