Deploy and test failures show the actual root cause (CAN-410)

[Saaketh0]

canyonos test just said it timed out after 60s, and deploy's Root Cause was buildx's generic line.

• test now prints Root Cause like deploy, in bright red
• build failures show uv's error/cause lines
• deploy reports stuck after 180s with no output
• dashboard port conflicts are a one-line warning

🤖 Generated with Claude Code

[coderabbitai]

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