fix: chore: consolidate issue templates into .forgejo/ISSUE_TEMPLATE/ — currently orphaned in .codeberg/, not read by Forgejo (#626)

.codeberg/ISSUE_TEMPLATE/feature.yaml

@@ -1,51 +0,0 @@
-name: Feature
-about: New functionality or enhancement
-labels:
-  - backlog
-body:
-  - type: textarea
-    id: problem
-    attributes:
-      label: Problem / motivation
-      description: Why is this needed? What's the current limitation?
-    validations:
-      required: true
-  - type: textarea
-    id: solution
-    attributes:
-      label: Proposed solution
-      description: How should it work? Be specific about behavior, not just "add X."
-    validations:
-      required: true
-  - type: textarea
-    id: affected-files
-    attributes:
-      label: Affected files
-      description: Which files need to change? Include test files if applicable.
-      placeholder: |
-        - lib/agent-session.sh
-        - formulas/run-gardener.toml
-    validations:
-      required: true
-  - type: textarea
-    id: acceptance
-    attributes:
-      label: Acceptance criteria
-      description: Checkboxes. Max 5 — if you need more, split the issue.
-      placeholder: |
-        - [ ] Feature works as described
-        - [ ] Tests added / updated
-        - [ ] CI green
-    validations:
-      required: true
-  - type: textarea
-    id: deps
-    attributes:
-      label: Dependencies
-      description: Issues that must be merged first. Leave empty if none.
-      placeholder: "- #NNN (reason)"
-  - type: textarea
-    id: context
-    attributes:
-      label: Additional context
-      description: Links to docs, prior art, design decisions, related issues.