chore: add go.mod, issue templates, and contributing guide

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Report a bug or unexpected behavior
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: A clear description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What did you expect to happen?
+    validations:
+      required: false
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: How can we reproduce this?
+    validations:
+      required: false
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: OS, Go version, kernel version, Firecracker version, etc.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature Request
+description: Suggest an improvement or new feature
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What would you like?
+      description: Describe the feature or improvement.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: Why is this useful? What problem does it solve?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question about usage or internals
+labels: ["question"]
+body:
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: What would you like to know?
+    validations:
+      required: true

.github/pull_request_template.md

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+Pull requests are not accepted. This repo is a read-only mirror synced from upstream.
+
+Please open an issue instead.

CONTRIBUTING.md

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+This repository is a read-only mirror synced from a private upstream.
+
+Issues are welcome. Pull requests are not accepted.

go.mod

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+module github.com/getcompanion-ai/computer-host
+
+go 1.26.1