chore(github): add issue and pull request templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report reproducible incorrect behavior in Splice Shell.
+title: "fix: "
+labels:
+  - "status:needs-review"
+  - "type:bug"
+body:
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Preflight checks
+      options:
+        - label: I searched open and closed issues and found no duplicate.
+          required: true
+        - label: I understand a maintainer must add `status:approved` before work begins or a pull request is opened.
+          required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug description
+      description: Clearly describe the incorrect behavior and its impact.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Start Splice Shell with ...
+        2. Run ...
+        3. Observe ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: Include the exact error or visible result.
+    validations:
+      required: true
+  - type: dropdown
+    id: operating-system
+    attributes:
+      label: Operating system
+      options:
+        - Windows
+        - Linux
+        - WSL
+        - Other
+    validations:
+      required: true
+  - type: input
+    id: os-version
+    attributes:
+      label: Operating system version
+      placeholder: Windows 11 24H2, Ubuntu 24.04, WSL2, or equivalent
+    validations:
+      required: true
+  - type: dropdown
+    id: ai-cli
+    attributes:
+      label: AI CLI
+      description: Select the client involved, or Not applicable.
+      options:
+        - Claude Code
+        - Codex CLI
+        - Gemini CLI
+        - OpenCode
+        - Other
+        - Not applicable
+    validations:
+      required: true
+  - type: input
+    id: shell
+    attributes:
+      label: Shell
+      placeholder: PowerShell, bash, zsh, fish, or other
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Splice Shell version or commit
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: Remove secrets and personal information before submitting.
+      render: shell
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add screenshots, frequency, regressions, or known workarounds.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links: []

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose an improvement to Splice Shell.
+title: "feat: "
+labels:
+  - "status:needs-review"
+  - "type:feature"
+body:
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Preflight checks
+      options:
+        - label: I searched open and closed issues and found no duplicate.
+          required: true
+        - label: I understand a maintainer must add `status:approved` before work begins or a pull request is opened.
+          required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What user problem or limitation should Splice Shell address?
+      placeholder: Describe who is affected, what they are trying to do, and why the current behavior is insufficient.
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: Describe the desired behavior from the user's perspective.
+    validations:
+      required: true
+  - type: dropdown
+    id: area
+    attributes:
+      label: Affected area
+      options:
+        - Terminal and PTY
+        - AI CLI compatibility
+        - Desktop UI (TypeScript)
+        - Desktop backend (Rust)
+        - Windows
+        - Linux
+        - WSL
+        - Build, packaging, or release
+        - Documentation
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Describe workarounds or other approaches you evaluated.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add examples, screenshots, compatibility constraints, or related links.

.github/PULL_REQUEST_TEMPLATE.md

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+## Linked issue
+
+Closes #<!-- approved issue number -->
+
+- [ ] The linked issue has the `status:approved` label.
+
+## Pull request type
+
+Select exactly one option and apply the matching `type:*` label.
+
+- [ ] Bug fix (`type:bug`)
+- [ ] New feature (`type:feature`)
+- [ ] Documentation (`type:docs`)
+- [ ] Refactor (`type:refactor`)
+- [ ] Maintenance or tooling (`type:chore`)
+- [ ] Breaking change (`type:breaking-change`)
+
+## Summary
+
+- <!-- What outcome does this pull request deliver? -->
+- <!-- Why is this approach appropriate? -->
+
+## Changes
+
+| Area or file   | Change                        |
+| -------------- | ----------------------------- |
+| `path/to/file` | Describe the relevant change. |
+
+## Test plan
+
+- [ ] Ran the focused automated checks: `command and result`
+- [ ] Exercised the affected terminal, AI CLI, or desktop workflow: `scenario and result`
+- [ ] Verified relevant Windows, Linux, or WSL behavior, or documented why it is not applicable.
+
+## Chained pull request context
+
+Complete this section when the change is part of a chain; otherwise write `Not applicable`.
+
+- Previous PR: <!-- #number or Not applicable -->
+- Next PR: <!-- #number, planned scope, or Not applicable -->
+- Review this PR first: <!-- files, behavior, or decision -->
+- Intentionally out of scope: <!-- follow-up work or Not applicable -->
+
+## Contributor checklist
+
+- [ ] I searched for duplicate issues and pull requests before starting.
+- [ ] I linked an approved issue using `Closes`, `Fixes`, or `Resolves`.
+- [ ] I selected exactly one pull request type and applied exactly one matching `type:*` label.
+- [ ] I completed every relevant template field and included reproducible test evidence.
+- [ ] I updated documentation when behavior or compatibility changed.
+- [ ] My commits follow Conventional Commits.
+- [ ] My commits contain no AI attribution, including `Co-Authored-By` trailers.