perf(flowchat): Keep long thinking lightweight #6992

Job	Run time
Build Impact	23s
Shell Deploy Scripts	15s
DSH Profile Packaging (windows-latest)	52s
Rust Build Check (macos-15)	16m 40s
Rust Build Check (ubuntu-latest)	17m 14s
Rust Build Check (windows-latest)	16m 30s
Frontend Build	12m 45s
CLI Tests (macos-15)	12m 3s
CLI Tests (ubuntu-latest)	10m 48s
CLI Tests (windows-latest)	13m 5s
Impact-selected Linux / Relay Contract	0s
Rust / CLI Validation	4s
	1h 40m 39s

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