new SQLite table service_users maps OIDC identities (matrix localpart)
to service-specific usernames, handling auth boundary mismatches.
localpart() extracts the username from a matrix user ID.
delete_all_conversations() added for bulk reset after agent recreation.
all delete_* methods now log failures instead of silently discarding.
removed dead user_tokens table (tokens now live in vault).
Three memory channels: hidden tool (sol.memory.set/get in scripts),
pre-response injection (relevant memories loaded into system prompt),
and post-response extraction (ministral-3b extracts facts after each
response). User isolation enforced at Rust level — user_id derived
from Matrix sender, never from script arguments.
New modules: context (ResponseContext), memory (schema, store, extractor).
ResponseContext threaded through responder → tools → script runtime.
OpenSearch index sol_user_memory created on startup alongside archive.
