[RPG] Is there lore that reveals where the first seed from the Wizard of Wines winery went

All mentions, that I am aware of, regarding Bladesingers are below:

• AD&D 2^nd Edition / Complete Book of Elves

  Distinctive Appearance. Not only are they easily identifiable by their weapon of choice and catlike grace, Bladesingers are decorated with their weapon guild's distinctive tattoo. Each guild has a separate and unique tattoo depicting its style of weapon through an animal representation. Long swords are often represented by great cats such as lions or panthers, a whip would be shown as a striking snake, and so forth.

• AD&D 2^nd Edition / Elves of Evermeet

  On Evermeet they are organized into small warrior lodges, each specializing in a different weapon. They often tattoo themselves with old runes, and each lodge has a special symbol it's members tattoo themselves with to identify their membership.

Bladesingers are mentioned in the edition after AD&D 2^nd Edition, and despite its contradiction to 'guilds' or 'schools' there is no mention of any particular weapon (besides blades) to be in use.

• D&D 3^rd Edition / Races of Faerun

  Most bladesingers work alone, sufficient unto themselves, but in larger communities they sometimes have the opportunity to fight together in the same combat. Bladesingers are normally trained singly by another bladesinger, and the concept of anything as formalized as a bladesinger school is an absurd notion to them.

What that means, in that edition, is a school representing animals went to the way side. in the revised edition, D&D 3.5 Edition, Bladesingers were mentioned as well.

• D&D 3.5 Edition / Complete Warrior

  Bladesingers are elves who have blended art, swordplay, and arcane magic into a harmonious whole.

It is essentially a copy paste, with a lot omitted, from Races of Faerun. Only "swordplay" and "any martial weapon" is mentioned. Nothing about schools guilds at all. There is another book the Bladesinger is mentioned, but its essentially only a blurb.

• D&D 3.5 Edition / Races of the Wild

  Bladesinger (Complete Warrior): Practitioner of the quintessential elven martial art, the bladesinger is both a skilled mage and a deadly swordmaster.

Once again, only sword is mentioned; probably due to racial sword proficiency - and the implication of blade in the name Bladesinger. Eventually, near the end of this edition, Bladesingers became Duskblades, and lost its 'elf-only' motif.

• D&D 3.5 Edition / Player's Handbook II

  While the ability to cast arcane spells in armor originated with the elves, over the millennia the secrets of the duskblade have been disseminated to the other races, and today members of any race can become a duskblade.

No mention of guilds or schools, or even preferred weapons were mentioned. Any martial weapon it appeared to be - but spending a feat to use a whip...most people would say, "no thank you." Bladesingers were included in the edition after this one, much to my surprise. But, it discredits the 'different weapons' aspect entirely.

• D&D 4^th Edition / Neverwinter Campaign Guide

  Benefit: Choose a one-handed melee weapon with which you have proficiency, and that is a light blade or a heavy blade.

Now we come to D&D 5^th Edition, and you already have the published information on them thus far. Since, to my knowledge, that edition is to harken back to the days of simpler game-play and more intrinsic role-play; rather than the vice versa, take this opportunity to "Create Your Own" schools, guilds, and organizations.

There's one effect/ability that does this, but you've got to be a sprite... or get one!

(All thanks to @DrunkCynic, who put two and two together.)

In all of the core set and the Encounters supplements I can only find one thing that gets you a sort of divination of alignment: the sprite's Heart Sight ability:

The sprite touches a creature and knows the creature's current emotional state. If the target fails a DC 10 Charisma saving throw, the sprite also knows the creature's alignment. (MM, p.283)

As a third-level Warlock you can gain the Pact of the Chain boon and take a sprite as your familiar: "when you cast [Find Familiar] you can choose... [a] sprite. (PHB p.107)" And now you're just a touch and a telepathic back-and-forth away from knowing one's alignment.

Spells

There's nothing like the old Know Alignment of my youth. But you can Commune and pester your deity for the information.

Alternatively, you've got Glyph of Warding which can trigger on the alignment. (But process of elimination is slow.) Or you might be able to make a case to a GM that Detect Thoughts plus some skill at interpreting those thoughts might get you to alignment, but we're venturing past RAW, here. (Other spells in the ballpark are even more-problematic to try to apply with any surety.)

Magical Items

There are a few magical items that could be used in a process of elimination, as they will harm one of the wrong alignment. These items are: the Talismans of Pure Good/Ultimate Evil and the Books of Exalted Deeds/Vile Darkness. (The Obsidian Steed has a small probability of also achieving this.)

Many items can only be attuned by one of the proper alignment, but I can't think of a way to force another's attempt to attune. If you could, though, we've got a clear winner: the Eye or Hand of Vecna, either of which will change the user's alignment to NE.

[Over]Kill

A coworker reminded me at lunch of the one I'd missed: kill the target, and follow its soul to its eventual destination. Not very practical, but neither are any of the magical items....

For your reference, an Angry GM article on how vestigal alignment has become in 5e. However, he does have some constructive ideas on how to make alignment more relevant, too. (Be warned: Angry GM's materials are liberally... flavored with rude and vulgar language.)