v0.3.0 — Tier A NEON + Performance Ledger (public launch)

Quiver's public-launch release (the charter's 9-month shrink point — the repository state is certified releasable-as-final).

NEON backends for all six Tier A kernel families — runtime-dispatched on ARM64, bit-identical to the scalar references (dense float sums follow the documented ADR-013 blocked policy), validated by the differential matrix and ~1M+ differential-fuzz executions per family under ASan+UBSan.

The performance ledger ships as a product: QLS-1 schemas, a reproducible stdlib-only runner (seeded percentile-bootstrap statistics, fresh-process shuffled repetitions, environment manifests, append-only results), and the first committed results from the registered Apple M2 (secondary platform, honestly flagged).

Verdicts — wins AND losses (neon vs autovec, Apple M2, geomean over published pairs): filter 1.72×, select 7.59×, reduce 4.43× (f64 blocked sums ~8× vs the strict baseline — see the ADR-013 caveat), mask 0.97× parity, take 1.00× parity (no gather on NEON, by design), compare 0.69× — the autovec baseline wins, published as measured per the Charter T7 pledge.

Coverage honesty: one registered microarchitecture at launch; the three-µarch gate (Zen 4/5, Golden Cove) is an open, recorded deferral — no numbers are invented. Reproduction: dispute guide.

Full notes: docs/releases/v0.3.0.md · Gate record: docs/releases/gates/M5.md