baseline(#137): pre-migration OTel span capture from da3901c

Raw Jaeger trace dumps (with and without incoming traceparent) plus a
derived span inventory and README describing the pre-migration span shape.
Captured from master da3901c release build against a local Jaeger; see
docs/tracing-baseline/pre-migration/README.md for the procedure and the
single span-neutral deviation (aux listen port 8088->18088).

Artifact branch only; /docs/* is gitignored, files force-added deliberately.

docs/tracing-baseline/pre-migration/traces-no-traceparent.json

@@ -0,0 +1 @@
+{"data":[{"traceID":"08455e5e41fe244713bdbce55178fb74","spans":[{"traceID":"08455e5e41fe244713bdbce55178fb74","spanID":"53b66e719b4da88b","operationName":"db.query.get_persona","references":[],"startTime":1790704286497358,"duration":97,"tags":[{"key":"db.operation","type":"string","value":"get_persona"},{"key":"db.query_type","type":"string","value":"query"},{"key":"otel.scope.name","type":"string","value":"db"},{"key":"otel.status_code","type":"string","value":"OK"},{"key":"span.kind","type":"string","value":"internal"}],"logs":[],"processID":"p1","warnings":null}],"processes":{"p1":{"serviceName":"image-server","tags":[{"key":"service.version","type":"string","value":"1.5.0"},{"key":"telemetry.sdk.language","type":"string","value":"rust"},{"key":"telemetry.sdk.name","type":"string","value":"opentelemetry"},{"key":"telemetry.sdk.version","type":"string","value":"0.31.0"}]}},"warnings":null},{"traceID":"33dd886ca35f036dc130e157d18cde88","spans":[{"traceID":"33dd886ca35f036dc130e157d18cde88","spanID":"b9886203d0340833","operationName":"db.insert.store_insight","references":[],"startTime":1790704373774193,"duration":6036,"tags":[{"key":"db.operation","type":"string","value":"store_insight"},{"key":"db.query_type","type":"string","value":"insert"},{"key":"otel.scope.name","type":"string","value":"db"},{"key":"otel.status_code","type":"string","value":"OK"},{"key":"span.kind","type":"string","value":"internal"}],"logs":[],"processID":"p1","warnings":null}],"processes":{"p1":{"serviceName":"image-server","tags":[{"key":"service.version","type":"string","value":"1.5.0"},{"key":"telemetry.sdk.language","type":"string","value":"rust"},{"key":"telemetry.sdk.name","type":"string","value":"opentelemetry"},{"key":"telemetry.sdk.version","type":"string","value":"0.31.0"}]}},"warnings":null},{"traceID":"6a3205b66ce3f4f25e849804437b4d2a","spans":[{"traceID":"6a3205b66ce3f4f25e849804437b4d2a","spanID":"689b895b8779feee","operationName":"db.query.get_event_count","references":[],"startTime":1790704423171303,"duration":458,"tags":[{"key":"db.operation","type":"string","value":"get_event_count"},{"key":"db.query_type","type":"string","value":"query"},{"key":"otel.scope.name","type":"string","value":"db"},{"key":"otel.status_code","type":"string","value":"OK"},{"key":"span.kind","type":"string","value":"internal"}],"logs":[],"processID":"p1","warnings":null}],"processes":{"p1":{"serviceName":"image-server","tags":[{"key":"service.version","type":"string","value":"1.5.0"},{"key":"telemetry.sdk.language","type":"string","value":"rust"},{"key":"telemetry.sdk.name","type":"string","value":"opentelemetry"},{"key":"telemetry.sdk.version","type":"string","value":"0.31.0"}]}},"warnings":null},{"traceID":"9f649ce92d6b31b1e85900a052388fd9","spans":[{"traceID":"9f649ce92d6b31b1e85900a052388fd9","spanID":"36e0c7e5a2ee06b0","operationName":"llm.request","references":[],"startTime":1790704423320965,"duration":31634307,"tags":[{"key":"http.status_code","type":"int64","value":200},{"key":"llm.model","type":"string","value":"qwen3.8-27b-abliterated"},{"key":"llm.operation","type":"string","value":"chat_stream"},{"key":"llm.provider","type":"string","value":"llamacpp"},{"key":"llm.tokens.input","type":"int64","value":6904},{"key":"llm.tokens.output","type":"int64","value":1422},{"key":"otel.scope.name","type":"string","value":"image-server"},{"key":"otel.status_code","type":"string","value":"OK"},{"key":"span.kind","type":"string","value":"client"}],"logs":[],"processID":"p1","warnings":null}],"processes":{"p1":{"serviceName":"image-server","tags":[{"key":"service.version","type":"string","value":"1.5.0"},{"key":"telemetry.sdk.language","type":"string","value":"rust"},{"key":"telemetry.sdk.name","type":"string","value":"opentelemetry"},{"key":"telemetry.sdk.version","type":"string","value":"0.31.0"}]}},"warnings":null},{"traceID":"b0339bf5be5b7ca90eded50c4c30ea8d","spans":[{"traceID":"b0339bf5be5b7ca90eded50c4c30ea8d","spanID":"4db108684f58fcaa","operationName":"db.update.update_training_messages","references":[],"startTime":1790704454955816,"duration":1631,"tags":[{"key":"db.operation","type":"string","value":"update_training_messages"},{"key":"db.query_type","type":"string","value":"update"},{"key":"otel.scope.name","type":"string","value":"db"},{"key":"otel.status_code","type":"string","value":"OK"},{"key":"span.kind","type":"string","value":"internal"}],"logs":[],"processID":"p1","warnings":null}],"processes":{"p1":{"serviceName":"image-server","tags":[{"key":"service.version","type":"string","value":"1.5.0"},{"key":"telemetry.sdk.language","type":"string","value":"rust"},{"key":"telemetry.sdk.name","type":"string","value":"opentelemetry"},{"key":"telemetry.sdk.version","type":"string","value":"0.31.0"}]}},"warnings":null},{"traceID":"e710521acc2fac9cf41374cb56cc2e8c","spans":[{"traceID":"e710521acc2fac9cf41374cb56cc2e8c","spanID":"29772615a01901bf","operationName":"db.query.count_for_library","references":[],"startTime":1790704268693001,"Line truncated