Epic: Kolektiv transfer — modernize TimezoneDB

[LizAinslie]

Goal

Bring TimezoneDB under KolektivComputer: branding, toolchain, Keel cutover, Minecraft claim, package IDs.

Sub-issues

• Confirm product name / Kolektiv branding for TimezoneDB #811 — Confirm product name / Kolektiv branding
• Toolchain & Dependabot: land safe bumps; plan major upgrades #812 — Toolchain & Dependabot
• Repo hygiene: AGENTS.md, DEVELOPING.md (Kalendee depth), org CONTRIBUTING #813 — Repo hygiene
• Convert TimezoneDB to Keel (host + packs) #814 — Convert to Keel (Vue for cutover; later smallest tested adapter)
• Minecraft platform: claim (NameMC) + modded server/client timezone display #817 — Minecraft NameMC-style claim
• Maven/npm IDs → computer.kolektiv.* (tzdb) #818 — Maven/npm → computer.kolektiv.*

Notes

• Dependabot: org policy (auto-merge non-breaking; comment on breaking)

[LizAinslie]

Minecraft work is now fully on #817 (supersedes #217).