Implements a version checker that runs during HTTP thread idle periods:
- Checks for Bun version updates at random intervals (30-180 seconds)
- Only runs when HTTP thread is idle (no active requests)
- Ensures only one check per idle period using state tracking
- Integrates with existing usockets sweep timer (4-second intervals)
- Uses existing HTTP infrastructure for version checking
- Includes basic test coverage
The checker activates during HTTP thread idle periods, making efficient
use of the existing 4-second sweep timer cycle. This provides automatic
update notifications without impacting performance during active usage.
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Co-Authored-By: Claude <noreply@anthropic.com>
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