docs: add feature request and blueprint issue templates

.github/ISSUE_TEMPLATE/blueprint_proposal.yml

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+name: Blueprint Proposal
+description: Propose a new evaluation blueprint
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: topic
+    attributes:
+      label: Domain / topic
+      description: What area should the blueprint evaluate?
+    validations:
+      required: true
+
+  - type: textarea
+    id: why
+    attributes:
+      label: Why it matters
+      description: Why is this evaluation important for the community?
+    validations:
+      required: true
+
+  - type: textarea
+    id: models
+    attributes:
+      label: Target models
+      description: Which models should be tested, if known?
+    validations:
+      required: false
+
+  - type: textarea
+    id: rubric
+    attributes:
+      label: Draft points / rubric
+      description: Sketch the scoring criteria and expected decision points.
+    validations:
+      required: false
+
+  - type: textarea
+    id: sources
+    attributes:
+      label: Links and sources
+      description: Supporting evidence, references, or example cases.
+    validations:
+      required: false
+
+  - type: markdown
+    attributes:
+      value: |
+        Before proposing, review [docs/BLUEPRINT_FORMAT.md](../../docs/BLUEPRINT_FORMAT.md).

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Propose an enhancement for Weval
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem are you trying to solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: What should the feature do, and where should it live?
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: What other approaches did you consider?
+    validations:
+      required: false
+
+  - type: textarea
+    id: scope
+    attributes:
+      label: Scope
+      description: Who benefits, and what is explicitly out of scope?
+    validations:
+      required: false