Summary

Fixes #861.

@electric-sql/pglite-sync now accepts the documented liveSse shape option and maps it to the current Electric client experimentalLiveSse option before creating the multi-shape stream. Existing explicit experimentalLiveSse values continue to take precedence.

Changes

• Add a small pglite-sync shape option normalizer for liveSse.
• Use the normalized options when constructing sync shape streams.
• Add focused regression coverage for liveSse mapping and precedence.
• Add the required changeset.

Testing

• pnpm install --frozen-lockfile
• pnpm --filter @electric-sql/pglite-sync test -- --run test/shapeStreamOptions.test.ts
• pnpm --filter @electric-sql/pglite-sync lint
• git diff --check

Verification gap: pnpm --filter @electric-sql/pglite-sync build, pnpm --filter @electric-sql/pglite-sync typecheck, and the existing test/sync.test.ts path could not complete in this local checkout because the generated @electric-sql/pglite package artifacts/types were not present.

Note: I used Codex while preparing this change, reviewed the final diff, and ran the checks listed above locally.