feat: initialize Hypothesis Machine Pi extension

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report reproducible incorrect behavior
+title: "[Bug]: "
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: Do not report security vulnerabilities here; follow SECURITY.md.
+  - type: input
+    id: version
+    attributes:
+      label: Hypothesis Machine and Pi versions
+      placeholder: Hypothesis Machine 0.1.1, Pi 0.83.0
+    validations:
+      required: true
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      options:
+        - Pi extension loading
+        - Recursive agents
+        - Research memory
+        - Web gateway
+        - Research loop
+        - Experiment runner
+        - Documentation or other
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: Include the expected result and a minimal reproduction.
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Sanitized logs
+      description: Remove credentials, private sources, and model transcripts.
+      render: shell
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Safety checks
+      options:
+        - label: I removed credentials and private data from this report.
+          required: true
+        - label: This is not a privately reportable security vulnerability.
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a focused extension improvement
+title: "[Feature]: "
+labels: [enhancement]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What research workflow is currently difficult or impossible?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed behavior
+      description: Explain how this should integrate with official Pi capabilities.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives and tradeoffs
+  - type: checkboxes
+    id: scope
+    attributes:
+      label: Scope
+      options:
+        - label: This does not require a Pi fork or a separate chat/TUI application.
+          required: true