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feat(wal): apply disk pressure backpressure - #1059
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Addresses the remaining core of #676. WAL data writes are rejected with a typed retryable error when disk usage crosses a configurable high-water mark or free-space reserve; ingest surfaces HTTP 503 with Retry-After. Adds Prometheus/JSON pressure metrics and keeps the startupProbe fix already merged in #700 untouched. Focused WAL disk-pressure regression passed locally; full CI remains authoritative.