agent execution --since/--window always returns "No executions found"

[nthmost-orkes]

Testing the agentspan CLI against a live 3.32.0-rc.9 server: conductor agent execution lists executions fine unfiltered and with --name, but every time filter returns nothing — even with executions created seconds earlier.

conductor agent execution                 # lists 50+ executions
conductor agent execution --since 1h      # No executions found
conductor agent execution --since 1d      # No executions found
conductor agent execution --window now-7d # No executions found

Tried all the documented formats (1h, 6h, 1d, 7d, now-7d) — every one comes back empty.

Root cause: the CLI builds freeText=startTime:[<ms> TO *], which the server's execution search (SQLite) doesn't honor. Confirmed against the raw endpoint:

/api/agent/executions?freeText=*                      → totalHits 69
/api/agent/executions?freeText=startTime:[<ms> TO *]  → totalHits 0

So --since / --window silently match nothing, and a user reasonably concludes they have no recent executions.

Fix: internal/agent/client.go → buildExecutionFreeText. Either emit a query the server's search backend supports, or fall back to client-side time filtering.