2.1.15

## What's Changed
* [NA] [BE] test: remove buggy compareMicroNanoTime comparator by @andrescrz in https://github.com/comet-ml/opik/pull/7316
* [NA] [FE] fix: enable Sonnet 5 and Fable 5 in playground and online scoring by @AndreiCautisanu in https://github.com/comet-ml/opik/pull/7318
* [OPIK-7139] [BE] [FE] BI events for Agent Insights + trigger_source by @aadereiko in https://github.com/comet-ml/opik/pull/7313
* [OPIK-7051] [DOCS] Add metrics-instrumentation agent skill by @thiagohora in https://github.com/comet-ml/opik/pull/7251
* [NA] [QA] fix: resolve test-suite id before closing bridge client by @AndreiCautisanu in https://github.com/comet-ml/opik/pull/7321
* [BE] fix: register azure as a canonical provider so Azure model prices load by @Anuj7411 in https://github.com/comet-ml/opik/pull/7262
* [OPIK-7177] [FE] fix: surface experiment traces in "Go to logs" and Playground trace link (scope by experiment_id) by @alexkuzmik in https://github.com/comet-ml/opik/pull/7322
* [OPIK-7149] [BE] refactor: remove AiSpend cost-analytics read endpoints superseded by ai-cost-backend by @BorisTkachenko in https://github.com/comet-ml/opik/pull/7326
* [NA] [BE][FE] chore: sync provider model definitions by @CometActions in https://github.com/comet-ml/opik/pull/7332
* [OPIK-6892] [BE] feat: NaN-aware aggregate validation + sentinel translation framework by @andrescrz in https://github.com/comet-ml/opik/pull/7307
* [OPIK-7197] fix: avoid materializing wide internal temp tables in prompt/dataset version lookups by @thiagohora in https://github.com/comet-ml/opik/pull/7328


**Full Changelog**: https://github.com/comet-ml/opik/compare/2.1.14...2.1.15