All-Building Upgrades

Give every building an upgrade line. Only Cursor and Grandma have one today, so from the Farm tier onward the store's upgrade section runs dry and the mid/late game loses its second purchase axis — buildings alone reduce it to "buy the biggest number".

The mechanics are pure content: the effect engine, unlock evaluation, and store UI already handle arbitrary upgrades. Each building needs a <Building>UpgradeMap merged into UpgradeMap, following the Cookie Clicker ladder — five Multiplicative value-2 upgrades unlocking at owned-count thresholds 1/5/25/50/100, priced at roughly 10× the building price at that threshold.

Why deferred

Icon art, not mechanics. Upgrade rows key their icon off the upgrade id (app/assets/clicker/icons/upgrades/<building>/<Upgrade Name>.png), so the ladder needs 85 new icons — one per upgrade across the 17 buildings. Without them every new row renders an empty icon slot.

Substituting a stand-in — the owning building's icon, or a generic mdi glyph — was considered and rejected. Clicker is a Cookie Clicker clone and uses its icon set, where every upgrade carries its own art; a repeated or generic icon is not that design, and shipping one would bank the content at the cost of the thing the game is imitating.

Revisit when

The 85 upgrade icons exist. The content maps are mechanical to rewrite once they do, and nothing else blocks: mergeObjectsStrict fails the build on id collisions, and saves are normalized to ids (game loop and saves), so shipped content stays rebalanceable afterwards.

Notes

• ClickerCompletionist ("buy every upgrade") reads Object.keys(UpgradeMap) dynamically, so it needs no change when the lines land — it simply gets harder.
• The effect engine's BuildingAdditive/BuildingAdditiveNor types already support cross-building synergy upgrades (Cursor's "Thousand Fingers" line demonstrates it), so those can follow the same way.