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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Test Plan

AI Verification

Validated at 68fa422 on Sep 4 22:22 UTC · 13 files analyzed · 1s

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

0 issues detected

_{Skipped validators: claude · EngWiki}

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