docs(design): define harvest progression stories

design/user-stories/us-001-track-crop-harvesting-progression.md

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+---
+type: User Story
+title: "US-001: Track crop harvesting progression"
+description: Track qualifying harvest activity independently for each player and supported crop.
+status: backlog
+---
+
+# US-001: Track crop harvesting progression
+
+As a **player**, I want my mature crop harvests tracked separately by crop so that my experience with each crop unlocks its own harvesting benefits.
+
+## Acceptance criteria
+
+- [ ] Initial progression paths exist independently for wheat, carrots, potatoes, and beetroot.
+- [ ] A crop contributes progress only when it is fully grown at the time a player harvests it.
+- [ ] Only crops harvested by a player in Survival mode contribute progress by default.
+- [ ] A manually broken mature crop contributes one unit to its matching crop path.
+- [ ] Each mature crop collected by an auto-harvest operation contributes one unit to the player who started that operation.
+- [ ] Sneaking prevents a manual break from starting auto-harvest but does not prevent the mature triggering crop from contributing progress.
+- [ ] Immature crops, unsupported crops, and non-harvest block changes do not contribute progress.
+- [ ] Progress is associated with the player's UUID and survives reconnects and server restarts.
+
+## Related
+
+- [US-002: Unlock crop auto-harvest levels](us-002-unlock-crop-auto-harvest-levels.md)
+- [US-003: Harvest connected mature crops](us-003-harvest-connected-mature-crops.md)
+- [US-007: Configure and persist harvesting behavior](us-007-configure-and-persist-harvesting-behavior.md)