The multiplex gateway imports plugins/platforms/matrix/adapter.py once, so
the module-level _STORE_DIR/_CRYPTO_DB_PATH resolved against the root
HERMES_HOME for every profile: all bots' Olm identities landed in one
crypto.db and inbound E2EE failed with "no session found" (#89168).
connect() runs inside _profile_runtime_scope, so resolve the store dir
there via get_hermes_dir (honors the context-local HERMES_HOME) and cache
it on the instance -- diagnostics and error-log paths read outside the
scope then still report the store actually in use. Mirrors the
pairing-store fix (a6397c379).
Salvage of #89169 (per-call resolvers collapsed into one cached resolve;
dead `_CRYPTO_DB_PATH = None` alias dropped -- no external importers).
Also routes the last raw MATRIX_HOMESERVER read in check_matrix_requirements
through _startup_env_secret like its token/password neighbours (#69943).
Fixes#89168
Co-authored-by: Michael Short <18595461+mjshorty@users.noreply.github.com>
001b8abbd4