fix(session): flatten tool history when a request declares no tools #3352

Job	Run time
Marker Guard	39s
Detect Changes	7s
Tracker Leaks	18s
Windows ripgrep E2E	2m 40s
TypeScript	13m 28s
Cold-start Config Regression	1m 2s
dbt-tools E2E	0s
dbt-tools	0s
Windows Installer (Pester)	0s
Driver E2E	0s
Sanity (Verdaccio)	0s
	18m 14s

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