Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/task_todo.yml

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+name: Task / To-Do
+about: Track a task with subtasks, owner, and effort estimate
+title: "[Task] "
+labels:
+  - task
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Detailed description of the task and expected outcome.
+    validations:
+      required: true
+
+  - type: input
+    id: assignee
+    attributes:
+      label: Owner
+      description: Who is responsible for this task?
+      placeholder: "@username"
+
+  - type: textarea
+    id: subtasks
+    attributes:
+      label: Subtasks
+      description: Break down the work into subtasks.
+      placeholder: |
+        - [ ] Subtask 1 — description
+        - [ ] Subtask 2 — description
+        - [ ] Subtask 3 — description
+    validations:
+      required: true
+
+  - type: input
+    id: effort
+    attributes:
+      label: Estimated Effort
+      description: "Time estimate, e.g. 2d, 4h."
+      placeholder: "e.g. 4h, 2d"
+
+  - type: textarea
+    id: dependencies
+    attributes:
+      label: Dependencies
+      description: List any blocking issues or PRs.
+
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance Criteria
+      description: What needs to be true for this task to be considered done.