* fix(doctor): detect + repair stale HERMES_MAX_ITERATIONS .env ghost shadowing config.yaml
hermes doctor now flags when ~/.hermes/.env carries a HERMES_MAX_ITERATIONS
value that disagrees with agent.max_turns in config.yaml, and 'hermes doctor
--fix' removes the stale .env line so config.yaml is authoritative. 'hermes
config show' surfaces the same drift inline under Max turns.
The setup wizard stopped dual-writing this value, but users who edited only
config.yaml from a pre-fix install keep a .env ghost. The gateway bridge
normally overrides it at startup, but if the bridge bails on any earlier
config-parse error the ghost silently wins — config says 400 while the
gateway activity line reads N/90.
The detector reads the .env FILE directly (load_env), not get_env_value/
os.environ, since the startup bridge may already have overwritten os.environ
with the config value.
Closes#17534.
* fix(config): stop offering HERMES_MAX_ITERATIONS as an editable env var
Removes HERMES_MAX_ITERATIONS from OPTIONAL_ENV_VARS so the dashboard env
editor (PUT /api/env) and any env-var prompt no longer let a user write it
to .env — which would recreate the stale ghost that shadows config.yaml's
agent.max_turns (issue #17534). The iteration budget is configured only via
config.yaml; the env var stays a read-only backward-compat fallback in the
gateway/CLI, never a promoted write target.
Regression test asserts it is absent from OPTIONAL_ENV_VARS.
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