Add GitHub issue and pull request templates

Adds structured templates for new agent requests, bug reports,
and pull requests to streamline contributions and ensure consistency.

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report an issue with an agent file (formatting, broken examples, etc.)
+labels: ["bug"]
+body:
+  - type: input
+    id: agent-file
+    attributes:
+      label: Agent file
+      placeholder: e.g. engineering/engineering-frontend-developer.md
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What's wrong?
+      placeholder: Describe the issue — broken formatting, incorrect examples, outdated info, etc.
+    validations:
+      required: true
+
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested fix
+      placeholder: If you have a fix in mind, describe it here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/new-agent-request.yml

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+name: New Agent Request
+description: Suggest a new agent to add to The Agency
+labels: ["enhancement", "new-agent"]
+body:
+  - type: input
+    id: agent-name
+    attributes:
+      label: Agent Name
+      placeholder: e.g. Database Engineer
+    validations:
+      required: true
+
+  - type: dropdown
+    id: category
+    attributes:
+      label: Category
+      options:
+        - engineering
+        - design
+        - marketing
+        - product
+        - project-management
+        - testing
+        - support
+        - spatial-computing
+        - specialized
+        - new category (describe below)
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What would this agent do?
+      placeholder: Describe the agent's specialty, when you'd use it, and what gap it fills.
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-cases
+    attributes:
+      label: Example use cases
+      placeholder: Give 2-3 real scenarios where this agent would be useful.
+    validations:
+      required: false