feat: add -d flag to bob build for automatic artifact download

[vtz]

Summary

• Adds -d <output-folder> / --download flag to bob build that waits for the build to complete and automatically downloads artifacts to the specified directory
• Supports both OCI artifacts (via oras pull) and file-based artifacts
• Prints phase transitions and elapsed time while waiting, with clear error messaging on failure

Closes #36

Test plan

• go build ./cmd/bob/ compiles without errors
• go vet ./cmd/bob/ passes
• go test ./cmd/bob/ all tests pass (including new flag tests)
• Manual: bob build <name> -d ./out triggers build, polls, and downloads on success
• Manual: bob build -f <file> -d ./out creates + polls + downloads
• Manual: verify build failure prints error and log hint

Made with Cursor

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 83a5891e-c5a5-4d06-91ae-74fc0a8efe9c

📥 Commits

Reviewing files that changed from the base of the PR and between 5e05db5 and 3cc2ea9.

📒 Files selected for processing (3)

• cmd/bob/build.go
• cmd/bob/wait.go
• cmd/bob/wait_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/build-download-flag

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