Avoid partial customer-facing releases during bulk uploads
The practical problem
Publishing an HTML page before its linked scripts and assets creates a broken public interval and makes rollback uncertain.
Implementation protocol
Upload complete files to private same-filesystem staging, validate owner and file hashes, then atomically rename into a previously absent versioned public directory.
Worked scenario
With release R1, users see either no R1 or the complete R1 directory; never publish R1 index while its game file is still being copied.
What could go wrong
Directory rename is not atomic across filesystems, and shared hosts require symlink checks.
Acceptance criteria
Simulate interruption halfway through staging.
Source material and evidence boundaries
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