Add second slot to two-by-two-table, server-closet, the-archive

[harshithmullapudi]

Summary

Follow-up to #42. The slot-collision validator caught the same pattern in three more catalog variants that ship a single npcPosition — any town pairing two NPCs in a positioning room, a growth war-room, or an archive would hit "collides with npcs[N]" on the second MDX.

Same pattern as office.pitch-wall: keep the existing tile as slot "" (single-NPC MDXs stay bound to the same visual position) and add one "second" slot per variant on a walkable tile.

• office.two-by-two-table — adds "second" at (11, 5). Row 5 walkable between the middle workstation (cols 7-8) and the right one (cols 12-13); plant snake (cols 10-11) ends at row 4.
• workshop.the-server-closet — adds "second" at (8, 4). Middle workstation feet — mirrors the existing (13, 4) position on the right workstation.
• library.the-archive — adds "second" at (10, 7). Second reading table on row 7, well inside the LIBRARY walkable rect.

Effect on bookface-town

After this + slotId edits on the MDXs, the four multi-NPC buildings render everyone:

Building	Variant	NPCs
officehours	office.pitch-wall (3 slots)	dalton "", pg left, seibel right
positioning	office.two-by-two-table (2 slots)	Dan "", Maya second
growthfloor	workshop.the-server-closet (2 slots)	Tomás "", Priya second
customerlab	library.the-archive (2 slots)	Frank "", Dr. Novak second

Test plan

• JSON parses cleanly (verified with node -e "require(...)").
• Existing single-NPC towns using any of these three variants keep rendering at the same tile.
• Deploy bookface-town after adding slotId: second to metrics-mirror.mdx (Priya), one-liner.mdx (Maya), user-interview.mdx (Dr. Novak) — passes the validator.
• Confirm no NPC sprite intersects a wall or gets stranded outside the walkable rect in-game.

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