feat(tests): implement live VM acceptance test strategy (TODO-006 to TODO-010)

docs/todo/TODO-009.md

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+# PRD #2 - Task 4/5: Mainsail and Fluidd install scenarios
+
+**Tags:** `task`, `prd-2`
+
+## Parent PRD
+
+PRD #2: Isolated live-system acceptance test strategy on Debian 12 VM (`docs/prd/PRD-002-live-vm-test-strategy.md`)
+
+## What to build
+
+Add install scenarios for Mainsail and Fluidd web clients. Assert that the static files are deployed and the reverse-proxy/service config is in place. Harden the snapshot-revert fixture so it runs reliably before every scenario.
+
+## Acceptance criteria
+
+- [ ] Mainsail install scenario passes on the VM.
+- [ ] Fluidd install scenario passes on the VM.
+- [ ] Expected outcomes check webroot directory and reverse-proxy config.
+- [ ] Snapshot revert fixture is robust (wait for SSH, error on revert failure).
+
+## Blocked by
+
+- TODO-008 (PRD #2 - Task 3/5: Remove Klipper and Moonraker scenarios)
+
+## Next task
+
+- TODO-010 (PRD #2 - Task 5/5: Backup, restore, and update scenarios)
+
+## User stories addressed
+
+- User story 3