v0.3.0

Highlights

• Model aliases (#315) — resolution-only, last-priority matchers with wildcard support. claude-fable-5[1m] and friends now route; the caller's exact string goes upstream verbatim.
• Catalog overlays (#316) — user edits as sparse patches on pristine catalog templates, merged at snapshot load. Catalog re-seeds/upgrades no longer clobber customizations; GET/PUT/DELETE /models/by-id/{id}/overlay.
• Emit-time usage cost (#311, #312) — every usage event carries cost_nanos + breakdown stamped at emit, attribution slugs throughout; no more join-at-query pricing.
• Usage analytics API (#305, #306) — latency/TTFT aggregates, group-by buckets, rejection-aware stats.
• Relay-key rotation (#303) — POST /relay-keys/by-id/{id}/rotate.
• Observability — request observability headers (#308), proxy payload tee capture (#309, #310), stress metrics (#307).
• Catalog — models.dev import tooling (#301), SDK catalog served-wire-name resolution fix (#314), refreshed embed (#302).

Embedded UI: relay-ui v0.3.0 (usage analytics overhaul, pricing CRUD, one-click key rotation).

Full changelog: v0.2.0...v0.3.0