feat(base): implement progression system

2026-08-09 15:01:44 -04:00
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+---
+type: User Story
+title: "US-003: Expand the base"
+description: Let players expand their base radius through sequential stone, deepslate, and obsidian mining milestones.
+status: in-progress
+---
+
+# US-003: Expand the base
+
+As a **player with Base I**, I want mining milestones to expand my base so that more of my build receives base benefits.
+
+## Acceptance criteria
+
+- [ ] Base-size progression is unavailable until Base I is unlocked.
+- [ ] Only qualifying blocks broken in Survival mode count.
+- [ ] The first expansion requires a configurable 500 `STONE` and changes the radius from 10 to 25 blocks by default.
+- [ ] After the stone tier, the second expansion requires a separate configurable 1,000 `DEEPSLATE` and changes the radius from 25 to 75 blocks by default.
+- [ ] After the deepslate tier, the third expansion requires a separate configurable 1,000 `OBSIDIAN` and changes the radius from 75 to 150 blocks by default.
+- [ ] Stone, deepslate, and obsidian variants do not count by default.
+- [ ] Materials mined before their sequential tier becomes active do not count toward that later tier.
+- [ ] Player-placed qualifying blocks may be mined repeatedly for progress.
+- [ ] Expansions affect the cylinder's horizontal radius without independently changing its vertical bounds.
+- [ ] Relocating the base preserves earned size tiers and counters.
+
+## Related
+
+- [US-001: Unlock and establish Base I](us-001-unlock-and-establish-base.md)
+- [US-004: Unlock and control base flight](us-004-unlock-and-control-base-flight.md)
+- [US-011: Configure and persist progression](us-011-configure-and-persist-progression.md)