core v0.10.0 — the reporting hook, the request record, compaction views, TTFT and latency

Compatible additions over core/v0.9.0 (the apidiff gate reports no incompatible changes): ReportFromContext/Reporter/AttemptInfo/RawPair (the reporting hook, ADR 0016's A8 note; mw.Retry and mw.Fallback report every attempt as an attempt span); the request record (ADR 0028: request, prompt and tools records with weft.instructions.hash on RunStart, weft.system.hash, weft.catalog.hash; ContentPrompt, ContentStop; Origin(name) for a tool's source); the run-scope compaction view record and (*Agent).LoggerProvider(); StepFinish.LatencyMS and TTFTMS with the answering model on the chat span. Nothing the model sees changes with recording on or off. Full notes: CHANGELOG.md, 0.10.0.