Prevent resuming a saved preset

[ZenAlexa]

Closes #4204.

What changed

• refuse dstack preset resume once the session has a committed preset.yml; cleanup may leave session.json at running, interrupted, or failed
• let the saved preset own the list row, using the creation session only to decorate its progress, so a stale cleanup status cannot produce a second row for the same ID
• cover the service-level gate, the CLI behavior, and stale interrupted/failed display states

Why

PresetStore.save() atomically commits the verified artifact before run cleanup. Cleanup is already best-effort and cannot invalidate that artifact, so its interruption must not make the completed creation resumable. A genuinely interrupted session with no saved preset keeps the existing resume behavior.

Verification

• uv run pytest -q src/tests/_internal/cli/services/presets src/tests/_internal/cli/commands/test_preset.py — 312 passed, 2 skipped
• uv run ruff check and uv run ruff format --check on the changed files
• uvx pyright --pythonpath .venv/bin/python -p . — 0 errors

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-30T06:16:04.768636Z	eeb4581	PR opened

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[ZenAlexa]

The focused preset tests, Ruff checks, and Pyright pass on the current head. The fork workflow is action_required; please approve run 33296412298 so the full Test Build matrix can start.

[ZenAlexa]

Thanks for enabling the fork workflow. The full Test Build matrix is now green across Linux, macOS, Windows, Python 3.10–3.14, frontend, runner, gateway, schema generation, and lint; eeb45819 is ready for review.