v1.3.0 — v3 browser proving unblocked

Highlights

• v3 polls vote and close from a browser: voteCastHomomorphic_8 and tallyDecrypt_8 now prove via the regular loadKeys path; no more server-only close-poll workflow. Closes #3.
• Root cause: gnark-crypto ecc/<curve>/twistededwards/point.go::PointExtended.Add reads curveParams.D without the initOnce.Do(initCurveParams) call its sibling Add/MixedAdd entry points all have. Anything that loads keys and proves — without first compiling a circuit in the same process — read curveParams.D == 0, mis-computed the scalar-mul hint, and tripped the in-circuit scalarMulFakeGLV check (constraint not satisfied). Latent on amd64; surfaced in the wasm browser flow because the browser only loads, never compiles. Full chase in docs/wasm-prove-bug.md.
• In-process workaround, no fork: one line at the top of cmd/prover-wasm/main.go::main — _ = babyjubjub.GetEdwardsCurve() — arms gnark-crypto's sync.Once for the rest of the process. The Go server doesn't need it (frontend.Compile runs at startup and trips the same init).
• CI green again: the Go-touching jobs all needed make wasm before make build / go vet / go test (the //go:embed all:*.wasm directive in public/embed.go requires the artifact to exist). Race-detector test pass split on -short so it doesn't time out under gnark's heavy ZK Setup.
• Regression test: prover/wasm32_loadkeys_only_test.go re-execs go test in a subprocess to reproduce the bug deterministically — pre-fix it fails at constraint not satisfied; post-fix it passes. Wired into make test-wasm-prove alongside the wasm-side node repro.

Commits

• b2e4bc2 ci: race-detector on -short, separate full pass without race
• 2e600e2 ci: bump race-test timeout to 30m, drop v3+prod from playwright
• cbb918b ci: build wasm prover before vet/build/test/playwright jobs
• 472b76d fix: drop the gnark-crypto fork — workaround in our wasm main is enough
• 5327633 fix: gnark-crypto twistededwards.PointExtended.Add missing initOnce.Do
• 379007f fix(wasm): unblock v3 browser proving via in-wasm cs recompile (#3)