Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug
+description: Unexpected existing behavior
+title: "[Bug] "
+labels:
+  - "type:bug"
+  - "status:needs-refinement"
+body:
+  - type: textarea
+    id: observed
+    attributes:
+      label: Observed behavior
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Reproduction steps
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: true
+
+  - type: textarea
+    id: evidence
+    attributes:
+      label: Evidence
+      description: Logs, screenshots, error messages, or failing test.

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature
+description: A normal product or engineering feature
+title: ""
+labels:
+  - "type:feature"
+  - "status:needs-refinement"
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem exists today?
+    validations:
+      required: true
+
+  - type: textarea
+    id: outcome
+    attributes:
+      label: Desired outcome
+      description: What should become possible?
+    validations:
+      required: true
+
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance criteria
+      placeholder: |
+        - [ ] Observable behavior one
+        - [ ] Observable behavior two
+        - [ ] Relevant failure path
+    validations:
+      required: true
+
+  - type: textarea
+    id: constraints
+    attributes:
+      label: Constraints
+      description: Security, compatibility, scope, architecture, or product constraints.
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Relevant context
+      description: Related files, docs, screenshots, issues, or decisions.

.github/ISSUE_TEMPLATE/quick-task.yml

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+name: Quick task
+description: A small, already-decided change
+title: ""
+labels:
+  - "status:ready"
+body:
+  - type: textarea
+    id: change
+    attributes:
+      label: Change
+      description: What needs to change?
+    validations:
+      required: true
+
+  - type: textarea
+    id: done
+    attributes:
+      label: Done when
+      description: List observable acceptance criteria.
+      placeholder: |
+        - [ ] Criterion one
+        - [ ] Criterion two
+    validations:
+      required: true