fix(control): exit stale UDP convoy after failed delete

[MaurUppi]

Summary

• fix remaining convoy residency path when tryDeleteQueue fails after mapping was already removed/replaced
• add regression test TestConvoyExitsWhenQueueMappingDeletedBeforeSelfDelete
• extend udp-taskpool-tdd.yml race test regex to include this regression guard

Root cause

When old convoy enters draining and another path deletes/replaces key -> q first, old convoy's self-delete fails. Existing logic reset timer and continued, allowing stale convoy to loop outside map and accumulate.

Validation

• go test -v -race -timeout 30s ./control/... -run "Test(UdpTaskPool|CompareAndDelete|NoGoroutineLeak|ConvoyExitAfterFailedDelete|ConvoyExitsWhenQueueMappingDeletedBeforeSelfDelete|HighConcurrencyStress)"
• go test ./component/sniffing -run "TestIsLikelyQuicInitialPacket" -count=1

[github-actions]

UDP TaskPool TDD Summary

• Ref: 27/merge
• Commit: bcc75f176f00e63ccbf203f669dd2146011e84f8
• Overall: pass (2/2 passed)
• Workflow run: https://github.com/MaurUppi/dae/actions/runs/22514228002
• Full report artifact: udp-taskpool-tdd-22514228002

Test Status

• ✅ go test -race ./control/... -run Test(UdpTaskPool|CompareAndDelete|NoGoroutineLeak|ConvoyExitAfterFailedDelete|HighConcurrencyStress): pass
• ✅ go test ./component/sniffing -run TestIsLikelyQuicInitialPacket: pass

Suite Delta (time/op geomean)

• Before (base): origin/main
• After (head): bcc75f176f00e63ccbf203f669dd2146011e84f8
• Bench params: -count=3 -benchtime=200ms

Suite Status

• ✅ udp_taskpool_compare_and_delete: pass
• ✅ udp_taskpool_core: pass
• ✅ udp_taskpool_load_and_delete_pattern: pass

Delta

• udp_taskpool_compare_and_delete: n/a (no common benchmark delta)
• udp_taskpool_core: n/a (no common benchmark delta)
• udp_taskpool_load_and_delete_pattern: n/a (no common benchmark delta)

[github-actions]

DNS Benchmark Compare Summary

• Before (base): origin/main
• After (head): bcc75f176f00e63ccbf203f669dd2146011e84f8
• Base strategy: merge-base
• Suite profile: dns-module
• Overall: pass (6/6 passed)
• Workflow run: https://github.com/MaurUppi/dae/actions/runs/22514228001
• Full report artifact: dns-benchmark-compare-22514228001

Suite Status

• ✅ component_upstream_hotpath: pass
• ✅ control_cache_hotpath: pass
• ✅ control_cache_regression_guard: pass
• ✅ control_cache_structures: pass
• ✅ control_core_flow: pass
• ✅ control_singleflight_scale: pass

Suite Delta (time/op geomean)

• component_upstream_hotpath: 2.315n -> 2.490n (Δ +7.56%)
• control_cache_hotpath: 12.95n -> 12.46n (Δ -3.79%)
• control_cache_regression_guard: 123.0n -> 130.3n (Δ +5.97%)
• control_cache_structures: 42.62n -> 43.59n (Δ +2.27%)
• control_core_flow: 252.9n -> 250.1n (Δ -1.14%)
• control_singleflight_scale: 117.0µ -> 105.6µ (Δ -9.74%)