feat(queryengine): adaptive Plan Cache for table model queries#17490

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Young-Leo:ly/planCache2

Commits on Apr 15, 2026

feat(queryengine): introduce adaptive Plan Cache state machine and improve planning observability
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fix: use real firstResponseLatency, add ACTIVE->MONITOR degradation, externalize config
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fix: EXPLAIN ANALYZE should bypass plan cache HIT to produce analysis output
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Add plan cache diagnostics to EXPLAIN ANALYZE VERBOSE output
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Skip first sample in plan cache EWMA to avoid JVM warmup noise
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Plan Cache: tune thresholds to 0.30/0.20 and add HIT-path latency tracking design
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docs: clarify architecture diagram and add recordExecution path table
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chore: remove auxiliary files not intended for PR
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