feat(policy): support load-bias and retry-after balancer annotations - #15317

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amr/load-bias-retry-after

Commits on May 26, 2026

build: use linkerd2-proxy-api 0.19.0 for new proto types
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feat(policy-core): add LoadBiasConfig and RetryAfterConfig types
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feat(policy-grpc): use load_bias and retry_after in protocol serialization
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refactor(policy-test): update failure_accrual_consecutive for new proto
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feat(policy-k8s): harden parse_duration with better error diagnostics
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feat(policy-k8s): add annotation parsing for load-bias and retry-after
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feat(policy-runtime): validate load-bias and retry-after at admission
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test(policy): add integration tests for new config types
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docs(policy): note that Service annotations are not admission-validated
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