feat(base): implement progression system

2026-08-09 15:01:44 -04:00
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+---
+type: User Story
+title: "US-005: Unlock Base III teleportation"
+description: Let players earn a safe, stationary-warm-up teleport to their personal base.
+status: in-progress
+---
+
+# US-005: Unlock Base III teleportation
+
+As a **player with Base II**, I want to earn `/base` so that I can return safely to my established base.
+
+## Acceptance criteria
+
+- [ ] Base III requires Base II, an established base, and a configurable 200 qualifying block placements inside the base.
+- [ ] Only placements made in Survival mode and within the base's current horizontal and vertical bounds count.
+- [ ] Player-placed blocks and replacement of previously broken blocks may contribute repeatedly.
+- [ ] Base III unlocks `/base` with a configurable 30-second warm-up and three-hour cooldown by default.
+- [ ] Looking around without changing block coordinates does not cancel the warm-up.
+- [ ] Changing block X, Y, or Z, taking damage, teleporting, changing worlds, dying, disconnecting, or starting a conflicting teleport cancels the warm-up.
+- [ ] Cancellation clearly informs the player and does not consume the cooldown.
+- [ ] The destination is a safe standing location at or near the recorded base center.
+- [ ] An unavailable or unsafe destination is reported clearly and does not consume the cooldown.
+- [ ] Only a completed teleport starts the cooldown.
+- [ ] Cooldowns use real elapsed time and continue while the player is offline.
+
+## Related
+
+- [US-001: Unlock and establish Base I](us-001-unlock-and-establish-base.md)
+- [US-002: Unlock Base II navigation](us-002-unlock-base-navigation.md)
+- [US-006: Reduce the base teleport warm-up](us-006-reduce-teleport-warmup.md)
+- [US-007: Reduce the base teleport cooldown](us-007-reduce-teleport-cooldown.md)
+- [US-008: Unlock Base IV visitor access](us-008-unlock-visitor-access.md)