Recent spot activity

GET /v1/portfolio/spot/activity

Cross-chain spot activity feed (swaps + transfers) for the user's primary wallet, sourced from Minara /v1/tx/cross-chain/activities. Failed or unreadable upstream lists and malformed activity rows return HTTP 502 (spot_activity_unavailable), not successful empty history. A valid empty list remains a successful response. Existing tag, terminal-token and normalized amount semantics are preserved.