feat(installer): add viz to repo menu (option 9)

[WomB0ComB0]

Summary

The `viz` repo (3D visualization — Three.js/Cesium web viewers + Unity .NET) is public, listed in `dev/README.md`'s ecosystem table, but was missing from both installers. Drift closed.

• `install.sh`: `VALID_REPOS` gains `viz`; menu prompt extends to `1-9`; case arm for option 9 → `viz`; `print_repo_info` gains a section describing the TypeScript web viewers + Unity .NET 9 solution.
• `install.ps1`: `$ValidRepos` gains `'viz'`; menu shows option 9; switch maps `'9' -> 'viz'`; `Show-RepoInfo` gains a matching branch.

`ardupilot` is public but a fork of `ArduPilot/ardupilot` — not added (it's not a ResQ dev repo).

Test plan

• `sh -n`, `bash -n`, `shellcheck install.sh` all clean
• `REPO=viz YES=1 sh install.sh` (in a throwaway dir / VM) clones viz and prints the What's included block
• `./install.sh` interactive → option `9` works

Follow-up (not in this PR)

If the org adds more repos frequently, switch the hardcoded menu to a runtime `gh api /orgs/resq-software/repos` fetch with the hardcoded list as fallback. Worth doing if this breaks 10+ entries; fine hardcoded for now.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6cda2df4-036e-4d8f-b826-34d163938633

📥 Commits

Reviewing files that changed from the base of the PR and between b6d6a07 and 787bfe5.

📒 Files selected for processing (2)

• install.ps1
• install.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/installer-add-viz

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[gemini-code-assist]

Code Review

This pull request adds a new repository option named 'viz' for 3D visualization to both the PowerShell (install.ps1) and Shell (install.sh) installation scripts. The changes include updating the valid repository lists, adding a new menu selection (option 9), and providing descriptive information for the new repository. I have no feedback to provide.