The reload-based state-dir tests (importlib.reload(api.config) with mutated env)
leaked recomputed STATE_DIR/SESSION_DIR globals + stale references into later
tests in the full sequential run -> 17 spurious failures in cancel/stream/
health/state-isolation suites (all green in isolation). Restoring env + reloading
couldn't fully undo it (fixture/monkeypatch teardown ordering + other modules
holding by-value STATE_DIR refs). Rewrite the 3 tests to import api.config in a
fresh SUBPROCESS under the target env and read STATE_DIR from stdout — truly
isolated, can't pollute the test process. Same assertions (HERMES_HOME-derived
default, unset->platform default w/ cross-check, STATE_DIR override precedence).
Opus flagged a real upgrade gap on the #4449 state-dir contract folded into
#4454: a deployment that relocated HERMES_HOME to a non-default base WITHOUT
setting HERMES_WEBUI_STATE_DIR sees WebUI state move to $HERMES_HOME/webui on
upgrade (empty app at the new address). Add (1) README note documenting the
move + how to keep the old location, and (2) two backward-compat regression
tests pinning the invariants: HERMES_HOME-unset stays at the platform default
(normal installs don't relocate), and HERMES_WEBUI_STATE_DIR takes precedence.
The /api/profiles handler re-imported _is_isolated_profile_mode locally inside
handle_get, which made the name function-local for the ENTIRE handle_get scope
-> the earlier use at the /api/projects branch (routes.py:8000) hit
UnboundLocalError (F823), failing 6 test shards + lint. It's already a
module-level re-export (routes.py:429), so the local re-import is redundant;
removing it lets every in-function use resolve to the module global. Also drop
an unused 'from pathlib import Path' in the new #4449 state-dir test.
Co-authored-by: rodboev <rodboev@users.noreply.github.com>
