Backports the Orkes workflow classifier concept to OSS. The classifier is a
tag derived from WorkflowDef.metadata (explicit metadata.classifier wins,
else 'agent' when the AgentSpan stamp agent_sdk/agentDef is present, else
'workflow' for plain untagged defs).
- common: new WorkflowClassifier utility; WorkflowSummary gains a classifier
field (proto field 23) populated at index time
- rest: GET /metadata/workflow supports ?classifier= filtering; workflow
/search and /search-v2 support &classifier=, folded into the structured
query as 'classifier IN (...)'
- postgres/sqlite: classifier column on workflow_index (Flyway V17 / V5),
written on index and filterable via the query builders; the 'workflow'
token also matches pre-migration NULL rows
- es7/es8/os2/os3: classifier keyword mapping for workflow documents
bradyyie
0a5abcacb5