feat: add Interview Prep Town (content-only)

[AggManik]

Summary

Adds a new showcase town — Interview Prep Town (interview-prep) — a content-only town with 4 department buildings, each housing role-specific dual-mode (Coach / Mock Interview) NPCs. No engine, catalog, or schema changes; purely towns/interview-prep/ content plus the spec/plan docs.

• The Dev Den (Tech) — Backend/AI, Frontend, ML/Data (3 NPCs)
• The Sales Floor — Account Executive, SDR/BDR, Sales Manager (3 NPCs)
• The Growth Lab (Marketing) — Growth, Product Marketing, Content/Brand (3 NPCs)
• The Product Room — PM, Designer (2 NPCs)

11 NPCs total, each following the shared template: Identity → dual-mode behavior (Coach / Mock Interview) → Role knowledge → Question bank → Rubric → Difficulty tiers → Style. Every department building has groupChatEnabled: true for panel-style [G] group chats.

Files

• towns/interview-prep/town.json — 5 buildings (home + 4 departments)
• towns/interview-prep/customPlots/{tech,sales,marketing,product}/plot.json — 4 custom plots, 10×7 interior footprint, all sprites reused from the existing catalog (no uploads needed)
• towns/interview-prep/npcs/*.mdx — 11 role NPC prompts
• docs/superpowers/specs/2026-07-03-interview-prep-town-design.md — product spec
• docs/superpowers/plans/2026-07-03-interview-prep-town.md — implementation plan

Important: town ownership

Like roast-town, this town's ownership is PAT-based at deploy time (there's no owner field in content — Town.ownerId in packages/db is set from the authenticated user when the town is first created, and is immutable afterward). This must be deployed using the same dedicated CORE-support account that owns roast-town — not a personal account — since a workspace can now own multiple towns.

How this was verified

Every task was validated with the structural check scripts from the plan (JSON parsing, slot-id ↔ NPC-filename consistency, sprite-ref presence in packages/catalog/src/catalog.json, Block B1/B2 boilerplate fully expanded with no leftover placeholders). A final whole-branch review confirmed:

• Zero changes under packages/ or apps/ (content-only, as required)
• town.json has exactly 5 buildings, all departments have groupChatEnabled: true, and each plotKey/variantId pair matches its plot.json
• All 11 NPCs are structurally consistent, role-specific (no generic filler reused across departments), and hold tone (never break character / reference being an AI)

Test plan

• Structural validation scripts (JSON parse + slot/filename/sprite consistency) — all pass, see commit history
• Deploy: pnpm --filter @redplanethq/town run dev-cli -- deploy --dir "$(pwd)/towns/interview-prep" --slug interview-prep as the CORE-support account
• In-app acceptance pass (spec §12): all 5 buildings render; NPC counts per department (3/3/3/2); every NPC greets and asks Coach vs. Mock Interview before anything else; Coach mode gives role-appropriate prep; Mock Interview mode asks one question at a time; [G] opens department group chat; no NPC breaks character

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