Add OpenWhispr easy setup installer and companion files

Single-file bash installer (setup-openwhispr.sh) with distro detection,
dependency installation, STT/AI cleanup provider selection, API key
management, and first-run launch. Includes README, LICENSE (MIT),
CHANGELOG, .gitignore, ShellCheck CI, issue templates, PR template,
and GitHub setup guide.

https://claude.ai/code/session_01XKYC1basxdwtHy71tky7xm

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a problem with the installer
+title: "[Bug] "
+labels: bug
+assignees: ""
+---
+
+## Describe the bug
+
+A clear and concise description of what went wrong.
+
+## Steps to reproduce
+
+1. Run `bash setup-openwhispr.sh`
+2. Choose option ...
+3. See error ...
+
+## Expected behaviour
+
+What you expected to happen.
+
+## Environment
+
+- **Distro**: (e.g., Ubuntu 24.04)
+- **Architecture**: (e.g., x86_64 / aarch64)
+- **Session type**: (X11 / Wayland)
+- **Desktop**: (GNOME / KDE / other)
+- **OpenWhispr version**: (if already installed)
+- **Script version**: (run `head -5 setup-openwhispr.sh`)
+
+## Terminal output
+
+```
+Paste relevant output here
+```
+
+## Additional context
+
+Anything else that might help.

.github/ISSUE_TEMPLATE/distro_report.md

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+---
+name: Distro compatibility report
+about: Report whether the installer works on your distro
+title: "[Distro] "
+labels: distro-report
+assignees: ""
+---
+
+## Distribution details
+
+- **Distro**: (e.g., Pop!_OS 24.04)
+- **Based on**: (e.g., Ubuntu / Debian / Arch / independent)
+- **Architecture**: (x86_64 / aarch64)
+- **Session type**: (X11 / Wayland)
+- **Desktop environment**: (GNOME / KDE / Sway / other)
+
+## Result
+
+- [ ] Script detected distro correctly
+- [ ] OpenWhispr installed successfully
+- [ ] Paste dependencies installed correctly
+- [ ] API keys stored correctly
+- [ ] OpenWhispr launched after install
+
+## Notes
+
+Any issues, workarounds, or suggestions for this distro.
+
+## Terminal output
+
+```
+Paste full script output here
+```

.github/pull_request_template.md

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+## What does this PR do?
+
+Brief description of the change.
+
+## Checklist
+
+- [ ] `bash -n setup-openwhispr.sh` passes (no syntax errors)
+- [ ] ShellCheck passes with no new warnings
+- [ ] Tested on at least one supported distro
+- [ ] Updated CHANGELOG.md if user-facing
+- [ ] No hardcoded paths or usernames (uses YOUR_USERNAME placeholder or is generic)
+
+## Testing
+
+Describe how you tested this change.
+
+## Related issues
+
+Closes #

.github/workflows/lint.yml

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+name: ShellCheck
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  shellcheck:
+    name: ShellCheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install ShellCheck
+        run: sudo apt-get install -y shellcheck
+
+      - name: Run ShellCheck
+        run: shellcheck -x setup-openwhispr.sh