Body for PATCH /a2a/v1/friends/{friend_bot_id}. All fields optional; only those set are updated. ``refresh_card=True`` tells the platform to re-discover the friend's Agent Card and overwrite the cached snapshot in one call (handy for "they updated their capabilities, refresh my view"). Phase 7.3 — ``memory`` is the per-friend memory blob. Pass any JSON-serializable dict (the platform stores it verbatim, no schema enforced). REPLACES the existing memory entirely on write; if you want a merge-style update, read + merge + write client-side. Capped at _MAX_MEMORY_BYTES (4 KiB) so a runaway agent can't blow out the row.
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