fix(queue): ISS-013 keep DLQ reconciliation retrying

[sbalabanov]

Summary

Intent:

• Keep final-DLQ reconciliation durable during dependency outages longer than any finite attempt budget.
• Preserve finite retry budgets for primary subscriptions.

Changes:

• Define MaxAttempts zero as unlimited in both direct Nack and visibility-expiry poll paths.
• Configure the shared DLQ subscription for unlimited retries with second-level dead-lettering disabled.
• Verify the orchestrator pipeline and Runway wiring inherit the shared behavior and update the operational docs.

Reproduction:

• A signal or storage dependency remains unavailable for more than 1000 DLQ reconciliation attempts.
• Previously the finite cap was exhausted; because the reconciliation subscription had its own DLQ disabled, MySQL acknowledged the row and advanced past it, losing the reconciliation message.
• The row now remains retryable until reconciliation succeeds or an operator removes it.

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_{Generated by the 🪄 pr-create skill in devexp-agent-marketplace}

Test Plan

• ./tool/bazel test //service/runway/server:all
• make fmt
• make lint
• make check-tidy
• make check-gazelle

Revert Plan

Revert commit 08152f6.

AI Verification

Validated at 08152f6 on Sep 17 22:03 UTC · 13 files analyzed · 2s

Validator	Status	Issues
arc-lint	not_applicable	0
android-coverage	not_applicable	0
ios-lint	not_applicable	0
uber-one	not_applicable	0
fix-disclosure	not_applicable	0
merge-conflict	not_applicable	0
app-validation	not_applicable	0
go-thrift-lint	not_applicable	0
java-coverage	not_applicable	0
ios-test	not_applicable	0
web-typecheck	not_applicable	0
web-coverage	not_applicable	0
diff-template	not_applicable	0
arc-unit	not_applicable	0
go-proto-lint	not_applicable	0
java-lint	not_applicable	0
web-repocheck	not_applicable	0
go-gazelle	not_applicable	0
android-lint	not_applicable	0
web-lint	not_applicable	0
web-unit	not_applicable	0
artifacts	completed	0
custom	not_applicable	0
ureview	completed	0
go-lint	failed	0
go-coverage	failed	0

0 issues detected

_{Skipped validators: claude · EngWiki}

Prior runs

Run at eeb6402 on Sep 17 18:05 UTC · 13 files · 2s · 0 issues detected

Issues

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[sbalabanov]

no need for this regression test

[sbalabanov]

Removed the unnecessary regression test in ee84d5f. The remaining table cases cover retry-budget behavior without testing the former implementation cap.

[addressed by agent]