chore: org-wide YAML issue forms + PR template at .github/ path

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Report a bug in any cogos-dev project
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to file a bug report. Please fill out
+        the fields below so we can reproduce and fix the issue.
+  - type: dropdown
+    id: project
+    attributes:
+      label: Which project?
+      options:
+        - cogos (kernel)
+        - cog-sandbox-mcp
+        - mod3 (voice)
+        - constellation (identity)
+        - charts (Helm)
+        - skills (marketplace)
+        - research
+        - desktop (archived)
+        - openclaw-plugin (archived)
+        - other / cross-cutting
+    validations:
+      required: true
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: A clear description of the behavior you observed.
+      placeholder: When I do X, Y happens.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect?
+      description: What should have happened instead.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: How to reproduce
+      description: Steps to reliably trigger the bug. Minimal repro preferred.
+      value: |
+        1.
+        2.
+        3.
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Output of `cogos version` or the commit SHA you built from.
+      placeholder: e.g. v0.3.0 or 1a2b3c4
+  - type: input
+    id: os
+    attributes:
+      label: OS
+      placeholder: macOS 15.1 / Ubuntu 24.04 / etc.
+  - type: input
+    id: runtime
+    attributes:
+      label: Go / Python version
+      placeholder: go1.24.2 / Python 3.12.4
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or output
+      description: Paste any relevant log output or error messages.
+      render: shell

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security report
+    url: https://github.com/cogos-dev/.github/blob/main/SECURITY.md
+    about: Report vulnerabilities per the security policy, not via public issues.

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature Request
+description: Suggest an improvement or new capability
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for the idea. Fill in the fields below so we can evaluate
+        the proposal and place it against existing roadmap.
+  - type: dropdown
+    id: project
+    attributes:
+      label: Which project?
+      options:
+        - cogos (kernel)
+        - cog-sandbox-mcp
+        - mod3 (voice)
+        - constellation (identity)
+        - charts (Helm)
+        - skills (marketplace)
+        - research
+        - other / cross-cutting
+    validations:
+      required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this solve?
+      description: Describe the user-facing or operator-facing need. Prefer
+        problem statements over solution statements.
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: How might this be addressed? Rough shape is fine — this is
+        a proposal, not a spec.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Other approaches you weighed and why they were set aside.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Links to related issues, ADRs, prior-art, or screenshots.

.github/PULL_REQUEST_TEMPLATE.md

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+## What
+
+Brief description of the change.
+
+## Why
+
+What problem does this solve?
+
+## How
+
+Key implementation details.
+
+## Checklist
+
+- [ ] Tests added/updated
+- [ ] CHANGELOG.md updated
+- [ ] Documentation updated (if applicable)
+- [ ] `go vet` / `ruff check` passes