chore: sync main to prod#2717

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evanliu048 wants to merge 8 commits intoprodfrom

Commits on Aug 21, 2025

feat: add tangent mode for context isolated conversations (#2634)
abhraina-aws
authored
Apply cargo +nightly fmt formatting (#2664)

kensave
and
kennvene-aws
authored

Commits on Aug 25, 2025

feat: implement agent-scoped knowledge base and context-specific search (#2647)
kensave
authored

Commits on Aug 28, 2025

feat: add tangent mode duration tracking telemetry (#2710)
abhraina-aws
authored