Run setup commands before image checks

[canercidam]

Fixes #403

[claude]

Claude finished @canercidam's task in 48s —— View job

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Summary: This PR moves RunSetupCommands to execute before WriteDockerComposeFile and pullNotAvailableImages (which happens inside Run). This allows setup commands (e.g., building custom images) to complete before the image availability check runs, fixing the ordering issue described in #403.

Verdict: Clean, minimal change. No issues found.

The three changes are straightforward:

1. main.go — ctx moved earlier (no behavioral change), RunSetupCommands called right after NewLocalRunner and before WriteDockerComposeFile/Run.
2. local_runner.go — Removes the runSetupCommands call from inside Run().
3. local_runner_lifecycle.go — Exports runSetupCommands → RunSetupCommands so it's callable from main.go.

No concerns with this change. LGTM.