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Droid finished @EffortlessSteven's task —— View job

Droid review validation complete.

No actionable findings emitted.

Inspected surfaces:

• crates/shipper-registry/src/context.rs: concurrent_version_exists_checks test

Checks performed:

• Registry publish correctness lens (test only, no publish logic changed)
• Diff correctness (constant introduced; hardcoded 5 replaced in two call sites)
• Shared-client concurrency coverage preserved (same client used across all handles)

Why no comments:
This diff touches only a test helper constant. It replaces two literal 5 values with a named constant CONCURRENT_REQUESTS = 2. The change is purely mechanical — no logic, no state, no registry interaction, no token handling, no event/state/receipt writes, no concurrency correctness change.

Residual risk:
None. This is a test-only change with no production impact.

Validation signal:
Observed: Diff reduces fanout from 5 to 2 concurrent mock requests.
Reported: PR #244 macOS nextest failed with localhost timeout pressure.
Not verified: Whether 2 concurrent requests is sufficient to catch the original concurrency bug — but this is a stabilization, not a new test, so the original coverage claim stands.