Session-hygiene compaction ran _compress_context on a bare
loop.run_in_executor(None, ...) worker. Under gateway.multiplex_profiles the
profile secret scope and HERMES_HOME override are ContextVars installed by
the per-turn _profile_runtime_scope, and a bare worker starts with an empty
Context — so the summary model's get_secret(<PROVIDER>_API_KEY) failed
closed with UnscopedSecretError on EVERY hygiene pass and compaction
silently degraded to a lossy truncation (#100849 debug bundle:
'Failed to generate context summary: get_secret(SURPLUS_API_KEY) called
with no profile secret scope active').
- gateway/run.py: run both hygiene executor hops (detached-agent path and
codex app-server path) inside copy_context().run, keeping the default
executor so a fence-cancelled hung summary never occupies a gateway
agent-work slot.
- agent/context_compressor.py: UnscopedSecretError is a missing-credential
class failure — abort and preserve the session instead of dropping the
middle window for a placeholder summary (same carve-out as 401/402/403).
- tools/daemon_pool.py: correct the salvaged docstrings — stdlib
ThreadPoolExecutor only propagates contextvars from 3.14; nothing is
stripped from the bundled runtime.
- tests: hygiene worker inherits caller ContextVars (fails on bare
run_in_executor); UnscopedSecretError classified as access failure.
Live A/B (real get_secret in a run_in_executor worker, multiplex on, profile
.env scope installed): main -> UnscopedSecretError; fixed -> scoped value.
Teknium
c5c9aa8d44