opencode-mobile is now the org's #1 Sentry volume source (~4,500 events/mo
against a 3,500/mo org quota, AGE-105). ~1,100 of those events are three
non-defects: `connect timeout` (462), `connect server-unreachable` (157), and
one device's `API Error: 401` token-refresh loop firing 498 times.
Adds a pure, unit-tested noise gate (src/lib/sentry-noise.ts) wired into
`beforeSend`, applying three layers cheapest-first:
1. Always-send allowlist — OOM/ANR/native/fatal crash classes bypass every
limit. Quota is worthless if it silences real crashes.
2. Transport drop-list — hard drop for client-side network conditions. Hard,
not sampled: the gate runs per-install, so "1 per device per day" would
multiply by the install base straight back into thousands per month.
3. Dedup + rate cap — 6h per-fingerprint cooldown, ≤6 new fingerprints/h,
≤10 events/h, mirroring the openclaw-box-bot shim (AGE-55).
Nothing is lost by the transport drop: those failures are already user-visible
as connection UI and already trended, PII-free, as the PostHog
`connection_failed{error_class}` event. captureDiagnostic() also short-circuits
for those classifications so the event is never even built. Drops are auditable
— the count since the last delivered event rides along as a
`noise.dropped_since_last` tag.
Replaying the observed 1,126-event hour through the gate yields 5 delivered
events (1 auth report + 4 real OOMs).
Tests: 18 new, 257 total passing; tsc --noEmit clean.
Co-authored-by: engineer <engineer@macbookpro.lan>
Co-authored-by: Paperclip <noreply@paperclip.ing>
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