P0.6 — elasticsql: cap-hit funnel instrumentation (TelemetryCollector.incrementCapHit + CoreDqlExtension QueryResults cap-hit)

[fupelaqu]

Story P0.6 — Pricing-funnel instrumentation (cap-hits), elasticsql leg

Pre-mortem Killer #2 / launch ship-blocker: the leading-indicator signal (cap-hits by quota type) is the only missing PRD §15.1 funnel class. This leg adds the SEMANTIC cap-hit primitive to the shared TelemetryCollector and wires the maxQueryResults reject site.

Changes

• licensing/.../TelemetryCollector.scala: NEW CapHitKind sealed trait {MaterializedViews, QueryResults, Joins, Clusters} (snake-case key); 4 independent lock-free AtomicLong cap-hit DELTA buckets; incrementCapHit(kind); collectAndResetCapHits() (getAndSet, all-4-keys); TelemetryData.capHitsByKind populated in collect (read, no reset) and collectAndReset (getAndSet); Noop overrides. Mirrors the Story-15.3 JOIN-bucket pattern exactly.
• core/.../extensions/CoreDqlExtension.scala: capture capHitCollector = licenseRefreshStrategy.telemetryCollector at initialize; incrementCapHit(QueryResults) on BOTH capOrReject branches — the explicit-LIMIT 402 reject AND the P0.5 no-LIMIT truncation/cappedScroll bite (OQ-2). Suppressed JOIN legs do not count (no double-count).
• Tests: TelemetryCollectorSpec (+10 cap-hit cases), CoreDqlExtensionSpec (+5 cap-hit cases). Both green.

Design decisions

• OQ-1: semantic incrementCapHit(kind) at each reject site, NOT 'count 402s' (joins/clusters never raise a 402).
• OQ-2: the no-LIMIT truncation IS counted as a QueryResults cap-hit.
• Cap-hits ride the existing InstancePing daily-ping delta (read via collect, like joinQueryCount).

Build

• + core/compile + + licensing/compile + + softclient4es-core-testkit/compile (cross 2.12+2.13) green
• licensing/testOnly *TelemetryCollectorSpec 24 green; core/testOnly *CoreDqlExtensionSpec 14 green; headerCheck clean
• publishLocal'd softclient4es-core + softclient4es-licensing 0.20-SNAPSHOT (unblocks extensions + arrow legs)

Part of the cross-repo P0.6 epic (elasticsql → extensions → arrow → license-server). Phase 0 final story.