Organize project tracking on Gitea (#13)

.gitea/issue_template/bug.md

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+---
+name: Bug report
+about: Incorrect behavior or a regression in Rivencraft
+title: ""
+labels: type/bug
+assignees: ""
+---
+
+## Observed behavior
+
+Describe what happened, including the dimension, book type, preview mode, and
+installed optional mods when relevant.
+
+## Expected behavior
+
+Describe what should have happened.
+
+## Reproduction
+
+1. List the minimum steps needed to reproduce the problem.
+2. Include the Rivencraft, NeoForge, and optional-mod versions.
+3. Attach the relevant log or crash report.
+
+## Acceptance criteria
+
+- [ ] The reproduction no longer fails.
+- [ ] A focused regression check covers the corrected behavior when practical.

.gitea/issue_template/task.md

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+---
+name: Implementation task
+about: A scoped feature, refactor, compatibility, or documentation task
+title: ""
+labels: type/feature
+assignees: ""
+---
+
+## Goal
+
+Describe the behavior or outcome this task should deliver.
+
+## Acceptance criteria
+
+- [ ] Add observable acceptance criteria.
+- [ ] Cover persistence, migration, or compatibility when applicable.
+- [ ] Record the validation required before closing the issue.
+
+## Context
+
+Link related issues, upstream references, and relevant design constraints.